10 Secrets of Liver Function Tests: A Helpful Health Guide

I. Introduction

Welcome to our comprehensive guide on Liver Function Tests (LFTs), where we embark on a journey to unravel the intricacies of the liver and the pivotal role it plays in maintaining our health. In this blog, we will delve into the significance of Liver Function Tests, shedding light on why monitoring the health of this vital organ is crucial for overall well-being.

A. Definition of Liver Function Test (LFT)

• Liver Function Tests (LFTs) are a set of blood tests conducted to assess the health and functionality of the liver.
• These tests provide valuable insights into the liver’s performance by measuring various enzymes, proteins, and other substances present in the blood.
• LFTs play a crucial role in diagnosing and monitoring liver diseases, helping healthcare professionals make informed decisions about patient care.

B. Importance of Monitoring Liver Function

• Monitoring liver function is essential for maintaining overall health and well-being.
• The liver, being a vital organ, performs numerous critical functions, including metabolism, detoxification, and the synthesis of essential proteins.
• Regular assessment through LFTs aids in early detection of liver dysfunction or diseases, allowing for timely intervention and management.
• This proactive approach is particularly crucial because liver diseases often exhibit minimal symptoms until they reach advanced stages.
• Early identification can significantly improve treatment outcomes and prevent further complications.

C. Overview of Liver and Its Functions

• The liver is the largest internal organ in the human body and is located in the upper right side of the abdomen.
• It plays a multifaceted role in maintaining physiological balance.
• Some key functions of the liver include:

1. Metabolism: The liver is involved in the metabolism of carbohydrates, fats, and proteins, ensuring a steady supply of energy to the body.
2. Detoxification: It acts as a detoxifying organ, breaking down and eliminating toxins, drugs, and other harmful substances from the bloodstream.
3. Synthesis of Proteins: The liver produces various proteins, including albumin and clotting factors, essential for maintaining blood volume and preventing excessive bleeding.
4. Storage of Nutrients: The liver stores important nutrients such as glycogen, vitamins, and minerals, releasing them as needed to support the body’s functions.

Understanding the intricate functions of the liver provides a foundation for appreciating the significance of LFTs in evaluating its health and performance. As we delve deeper into Liver Function Tests, we will explore the different types of tests, their interpretations, and the role they play in maintaining optimal liver function and overall well-being.

II. Anatomy and Physiology of the Liver

A. Structure of the Liver

• To truly appreciate the significance of Liver Function Tests, we must first understand the intricate architecture of the liver.
• The liver is a remarkable organ, both in size and complexity.
• Situated in the upper right quadrant of the abdomen, it boasts a unique structure comprising lobes and cells called hepatocytes.
• Blood vessels, including the portal vein and hepatic artery, intricately weave through the liver, facilitating nutrient exchange and metabolic processes.

B. Functions of the Liver

• The liver’s functions extend far beyond its structural elegance.
• It serves as a dynamic biochemical factory, orchestrating a symphony of processes essential for our body’s equilibrium.

1. Metabolism
   • At the heart of the liver’s responsibilities is its role in metabolism.
   • Carbohydrates, fats, and proteins undergo intricate transformations, ensuring a steady supply of energy to fuel the body’s activities.
   • The liver acts as a metabolic maestro, balancing nutrient utilization and storage to maintain optimal physiological conditions.
2. Detoxification
   • The liver acts as a guardian, diligently detoxifying the blood by breaking down and neutralizing toxins, drugs, and metabolic byproducts.
   • This detoxification process is a critical defense mechanism, protecting the body from potential harm and maintaining a delicate balance between internal and external influences.
3. Synthesis of Proteins
   • Among its many talents, the liver serves as a protein synthesis powerhouse.
   • It produces essential proteins, including albumin, which plays a crucial role in maintaining blood volume, and clotting factors that prevent excessive bleeding.
   • This synthesis ensures the body has the necessary components for proper functioning and repair.
4. Storage of Nutrients
   • The liver acts as a strategic storage facility, hoarding essential nutrients such as glycogen, vitamins, and minerals.
   • This reservoir allows the liver to release nutrients into the bloodstream as needed, supporting the body’s metabolic demands and contributing to overall homeostasis.

Understanding the structure and functions of the liver sets the stage for comprehending the nuances of Liver Function Tests. As we continue our exploration, we will delve into the specific markers that these tests assess, providing a roadmap for interpreting the results and gauging the health of this extraordinary organ.

III. Understanding Liver Function Tests

A. What are Liver Function Tests (LFTs)?

• Liver Function Tests, as the name suggests, are a battery of blood tests designed to evaluate the health and performance of the liver.
• These tests encompass a range of markers that provide insights into different aspects of liver function.
• By analyzing the levels of specific enzymes, proteins, and other substances in the blood, healthcare professionals gain valuable information about the liver’s well-being and its ability to carry out essential tasks.

B. Types of LFTs

• Liver Function Tests include a diverse set of markers, each serving a unique purpose in assessing different facets of liver function:

1. Alanine transaminase (ALT):
   • A key enzyme that, when elevated, may indicate liver damage or inflammation.
2. Aspartate transaminase (AST):
   • Another enzyme found in the liver, heart, and other organs, with elevated levels suggesting liver or heart issues.
3. Alkaline phosphatase (ALP):
   • An enzyme present in the liver and bones, elevated levels may signal liver or bone disorders.
4. Bilirubin:
   • A yellow pigment produced during the breakdown of red blood cells, abnormal levels can indicate liver or bile duct issues.
5. Albumin:
   • A protein produced by the liver, low levels may suggest liver disease or malnutrition.
6. Prothrombin time (PT):
   • Measures the time it takes for blood to clot, reflecting the liver’s ability to produce clotting factors.

C. Indications for Liver Function Tests

• Liver Function Tests are not only diagnostic tools but also valuable indicators in various medical scenarios.
• These may include:

1. Monitoring Chronic Liver Conditions:
   • For individuals with known liver diseases, regular LFTs help track the progression and severity of the condition.
2. Assessment of Medication Impact:
   • Certain medications may affect liver function, and LFTs are employed to monitor potential side effects.
3. Investigation of Unexplained Symptoms:
   • When individuals exhibit symptoms like jaundice, abdominal pain, or unexplained fatigue, LFTs can provide insights into potential liver involvement.

D. Preparation and Procedure for LFTs

• While Liver Function Tests are routine and minimally invasive, proper preparation is essential for accurate results:

1. Fasting:
   • Some LFTs may require fasting for a specific duration before the test to ensure accurate measurements.
2. Avoiding Certain Medications:
   • Certain medications can impact LFT results, and healthcare providers may advise temporarily discontinuing them before the test.
3. Informing Your Healthcare Provider:
   • Providing a comprehensive medical history, including any existing conditions or medications, is crucial for an accurate interpretation of LFT results.

In our next segment, we’ll unravel the mystery behind interpreting Liver Function Test results. From understanding normal ranges to deciphering what abnormal values may signify, we’ll equip you with the knowledge needed to navigate the outcomes of these essential tests.

IV. Interpreting LFT Results

A. Normal Ranges for Each LFT

• Before diving into the nuances of interpreting Liver Function Test (LFT) results, it’s crucial to understand the normal ranges for each marker.
• These ranges serve as benchmarks, allowing healthcare professionals to assess whether the levels fall within expected parameters.
• Common LFT components and their normal ranges include:

• Remember, these are general reference ranges, and specific values may vary based on the laboratory and individual health factors.
• Always consult with your healthcare provider for a thorough interpretation of your Liver Function Test results.

B. Understanding Elevated Levels

• Elevated levels in any of these markers may signal potential issues with liver function.
• Elevated ALT and AST levels, for example, can indicate liver inflammation or damage, while high levels of ALP may suggest problems with bile flow or bone disorders.
• Elevated bilirubin levels may point to issues with the liver or bile ducts, and low albumin levels may indicate liver disease or malnutrition.

C. Specific Conditions Indicated by Abnormal LFT Results

1. Liver Diseases (e.g., Hepatitis, Cirrhosis):
   • Elevated liver enzymes such as ALT and AST may be indicative of liver diseases, including viral hepatitis or cirrhosis.
   • These conditions compromise the liver’s ability to function properly, leading to increased enzyme release into the bloodstream.
2. Gallbladder Issues:
   • Altered ALP levels may suggest issues with bile flow, indicating gallbladder problems such as gallstones or inflammation.
3. Hemochromatosis:
   • Elevated ferritin levels in LFTs may suggest hemochromatosis, a condition where the body absorbs too much iron, leading to organ damage, including the liver.
4. Wilson’s Disease:
   • Abnormal copper levels in the blood, often assessed indirectly through LFTs, may indicate Wilson’s disease—a genetic disorder causing copper to accumulate in the liver and other organs.

Understanding the specific conditions associated with abnormal LFT results enables healthcare professionals to narrow down potential diagnoses, facilitating prompt and accurate intervention.

In our upcoming sections, we’ll explore common symptoms and risk factors associated with liver dysfunction, shedding light on why proactive monitoring through Liver Function Tests is crucial for maintaining optimal health.

V. Common Symptoms and Risk Factors

A. Symptoms of Liver Dysfunction

• Recognizing the symptoms of liver dysfunction is pivotal in early intervention and effective management.
• While liver diseases often progress silently, some common symptoms may serve as red flags:

1. Jaundice: Yellowing of the skin and eyes due to elevated bilirubin levels.
2. Fatigue: Persistent tiredness and weakness.
3. Abdominal Pain: Discomfort or pain in the upper right abdomen.
4. Swelling: Swelling in the abdomen or legs due to fluid retention.
5. Unexplained Weight Loss: Significant weight loss without apparent cause.
6. Changes in Stool or Urine Color: Pale stool or dark urine may indicate liver issues.

B. Risk Factors for Liver Diseases

• Understanding the risk factors associated with liver diseases is crucial for identifying individuals who may be more susceptible to liver dysfunction.
• Common risk factors include:

1. Alcohol Consumption: Excessive and prolonged alcohol consumption can lead to alcoholic liver disease.
2. Viral Hepatitis: Infections such as hepatitis B and C can cause chronic liver inflammation.
3. Obesity: Obesity is linked to non-alcoholic fatty liver disease (NAFLD), a condition characterized by fat accumulation in the liver.
4. Type 2 Diabetes: Individuals with diabetes are at an increased risk of developing liver problems.
5. Family History: Genetic factors can contribute to liver diseases, such as hemochromatosis or Wilson’s disease.

C. Importance of Early Detection through LFTs

• Early detection is a cornerstone of effective medical intervention, and Liver Function Tests play a pivotal role in this process.
• Here’s why early detection through LFTs is essential:

1. Timely Intervention:
   • Identifying liver dysfunction in its early stages allows for prompt intervention, potentially preventing the progression of the disease.
2. Prevent Complications:
   • Early detection enables healthcare professionals to implement strategies to prevent complications associated with advanced liver diseases, such as cirrhosis or liver failure.
3. Improved Treatment Outcomes:
   • Early diagnosis provides a window of opportunity for more effective and targeted treatment, improving the likelihood of successful outcomes.

• Regular monitoring through Liver Function Tests is especially crucial for individuals with risk factors or those experiencing symptoms of liver dysfunction.
• These tests serve as a proactive tool in the realm of preventive healthcare, allowing individuals and healthcare providers to work together in maintaining liver health.

As we progress in this exploration, we’ll delve into the specifics of Liver Function Test results, offering insights into how abnormal values can be indicative of various conditions.

VI. Importance of Regular Liver Function Testing

A. Preventive Healthcare and Routine Monitoring

• In the realm of healthcare, prevention often proves to be more effective than cure.
• Regular Liver Function Testing (LFT) serves as a powerful tool in preventive healthcare, allowing individuals to proactively monitor the health of their liver.
• By incorporating routine LFTs into healthcare regimens, potential issues can be identified at an early stage, providing an opportunity for timely intervention and lifestyle adjustments.
• Routine monitoring through LFTs is particularly beneficial for those with risk factors such as a family history of liver diseases, a history of excessive alcohol consumption, or underlying health conditions like diabetes and obesity.
• By making Liver Function Tests a part of routine health check-ups, individuals can stay ahead of potential liver concerns and take proactive steps to maintain overall well-being.

B. Screening for Liver Diseases

• Liver diseases, if left undetected, can progress silently, leading to severe complications.
• Liver Function Tests serve as a valuable screening tool, especially for individuals at a higher risk of liver diseases.
• Through regular screening, healthcare professionals can identify abnormal patterns in enzyme levels or other markers, prompting further investigation and diagnosis.
• Screening is particularly crucial for conditions like viral hepatitis, where early detection can prevent the development of chronic liver inflammation and the progression to more severe stages of the disease.
• Additionally, individuals with risk factors such as obesity and diabetes can benefit from regular screening to detect conditions like non-alcoholic fatty liver disease (NAFLD) before it advances.

C. Monitoring the Progress of Liver Conditions

• For those already diagnosed with liver conditions, regular Liver Function Testing is essential for monitoring the progress of the disease and assessing the effectiveness of treatment strategies.
• Conditions like chronic hepatitis, cirrhosis, or autoimmune liver diseases require ongoing evaluation to ensure that the prescribed interventions are producing the desired outcomes.
• By tracking changes in enzyme levels, bilirubin, and other relevant markers, healthcare providers can make informed decisions about treatment adjustments, lifestyle modifications, or the need for additional diagnostic tests.
• Monitoring the progress of liver conditions through regular LFTs is instrumental in managing these conditions effectively and enhancing the quality of life for individuals living with chronic liver diseases.

In the next segment of our exploration, we’ll delve into lifestyle and dietary factors that significantly impact liver health. From the role of nutrition to the impact of alcohol and substance abuse, we’ll unravel the elements that contribute to liver well-being.

VII. Lifestyle and Dietary Factors Affecting Liver Health

A. Role of Nutrition in Liver Health

• Nutrition plays a pivotal role in maintaining optimal liver health.
• The liver, being a metabolic hub, is directly influenced by the nutrients we consume.
• A balanced and nutritious diet supports the liver’s functions and helps prevent conditions such as fatty liver disease.
• Key dietary considerations for liver health include:

1. Moderate Protein Intake:
   • Protein is essential for the synthesis of liver proteins, such as albumin.
   • A well-balanced intake supports liver function without placing undue stress on the organ.
2. Healthy Fats:
   • Opting for healthy fats, such as those found in avocados, nuts, and olive oil, supports overall health and can prevent the accumulation of fat in the liver.
3. Complex Carbohydrates:
   • Choosing complex carbohydrates, such as whole grains and vegetables, helps regulate blood sugar levels, reducing the risk of insulin resistance and fatty liver disease.
4. Adequate Hydration:
   • Staying well-hydrated supports overall health and aids in the detoxification processes carried out by the liver.
5. Limited Sugar Intake:
   • Excessive sugar consumption can contribute to the development of fatty liver disease. Limiting added sugars helps maintain liver health.

B. Impact of Alcohol and Substance Abuse

• The liver is particularly susceptible to damage from alcohol and certain substances.
• Excessive alcohol consumption can lead to alcoholic liver disease, characterized by inflammation, fatty deposits, and, in severe cases, cirrhosis.
• Other substances, including certain medications and illicit drugs, can also harm the liver.
• Understanding the impact of alcohol and substance abuse on liver health is crucial for making informed lifestyle choices.
• For those with a history of alcohol abuse, abstinence or moderation is key to preventing further liver damage.
• Individuals taking medications known to affect the liver should do so under the guidance of a healthcare professional.

C. Importance of Maintaining a Healthy Lifestyle

• Beyond specific dietary considerations and substance avoidance, maintaining an overall healthy lifestyle is paramount for liver health.
• Incorporating the following habits contributes to the well-being of this vital organ:

1. Regular Exercise:
   • Physical activity promotes overall health and helps prevent obesity, a risk factor for fatty liver disease.
2. Weight Management:
   • Maintaining a healthy weight reduces the risk of conditions like non-alcoholic fatty liver disease.
3. Hygiene Practices:
   • Practicing good hygiene, such as avoiding sharing personal items that may carry infections like hepatitis, helps prevent the spread of infectious liver diseases.
4. Vaccination:
   • Getting vaccinated against hepatitis A and B is a preventive measure that can safeguard liver health.
5. Regular Health Check-ups:
   • Scheduled health check-ups, including Liver Function Tests, provide an opportunity for early detection and intervention.

By adopting a liver-friendly lifestyle, individuals can actively contribute to the longevity and well-functioning of this vital organ. In our concluding sections, we will explore practical tips for maintaining a healthy liver and delve into the challenges and limitations associated with Liver Function Tests.

VIII. Tips for Maintaining a Healthy Liver

A. Dietary Recommendations

1. Embrace a Balanced Diet:
   • Prioritize a diet rich in fruits, vegetables, whole grains, and lean proteins.
   • This provides essential nutrients for liver function and overall well-being.
2. Limit Processed Foods:
   • Processed foods often contain additives and preservatives that may burden the liver.
   • Opt for whole, unprocessed foods whenever possible.
3. Watch Sugar Intake:
   • Excessive sugar consumption can contribute to fatty liver disease.
   • Be mindful of added sugars in beverages, snacks, and processed foods.
4. Moderate Salt Intake:
   • High salt intake can lead to fluid retention and may contribute to liver damage.
   • Choose low-sodium options and flavor meals with herbs and spices.
5. Stay Hydrated:
   • A well-hydrated body supports the liver in its detoxification processes.
   • Aim for an adequate intake of water throughout the day.

B. Exercise and Physical Activity

1. Regular Exercise:
   • Engage in regular physical activity to maintain a healthy weight and reduce the risk of fatty liver disease.
   • Both aerobic exercises and strength training contribute to overall well-being.
2. Weight Management:
   • Achieve and maintain a healthy weight through a combination of regular exercise and a balanced diet.
   • Obesity is a significant risk factor for liver conditions.

C. Avoiding Excessive Alcohol Consumption

1. Moderation is Key:
   • If you choose to consume alcohol, do so in moderation.
   • For most adults, this generally means up to one drink per day for women and up to two drinks per day for men.
2. Know Your Limits:
   • Be aware of the recommended alcohol limits and stay within them.
   • Excessive alcohol intake is a leading cause of liver damage and can lead to conditions like alcoholic liver disease.

D. Importance of Regular Check-ups

1. Scheduled Health Check-ups:
   • Regular health check-ups, including Liver Function Tests, are crucial for early detection of liver issues.
   • These tests can uncover abnormalities before symptoms manifest.
2. Consultation with Healthcare Professionals:
   • If you have specific risk factors or concerns about your liver health, consult with healthcare professionals.
   • They can provide personalized advice and recommend appropriate preventive measures.
3. Vaccination:
   • Stay up-to-date with vaccinations, particularly for hepatitis A and B.
   • Vaccination is a proactive measure that can prevent certain liver infections.

By incorporating these tips into your lifestyle, you actively contribute to the health and resilience of your liver. Remember, small, consistent efforts over time can have a significant impact on your overall well-being.

In our final segment, we’ll address the challenges and limitations associated with Liver Function Tests. While these tests are valuable diagnostic tools, it’s essential to understand their nuances for accurate interpretation and informed decision-making.

IX. Challenges and Limitations of Liver Function Tests

A. False Positives and Negatives

1. False Positives:
   • Liver Function Tests, while highly informative, may occasionally yield false-positive results.
   • Elevated enzyme levels, such as ALT and AST, can occur due to factors unrelated to liver disease, such as muscle injury or certain medications.
   • This emphasizes the importance of considering clinical context and additional diagnostic measures.
2. False Negatives:
   • On the flip side, false-negative results can occur, especially in the early stages of some liver diseases.
   • Not all liver conditions manifest immediately in LFT results, underscoring the need for ongoing monitoring and a comprehensive assessment of clinical history.

B. Other Factors Affecting LFT Results

1. Medications:
   • Certain medications, including over-the-counter drugs, can influence Liver Function Test results.
   • Informing healthcare providers about all medications being taken ensures accurate interpretation.
2. Medical Conditions:
   • Coexisting medical conditions, such as muscle disorders or infections, can impact enzyme levels, leading to variations in LFT results.
3. Pregnancy:
   • Pregnancy can affect liver enzyme levels, and adjustments may be needed when interpreting LFT results in pregnant individuals.
4. Age and Gender:
   • Normal ranges for LFT markers may vary with age and gender.
   • Healthcare providers consider these factors when assessing results.

C. Additional Diagnostic Methods for Liver Evaluation

• While Liver Function Tests offer valuable insights, they are part of a broader spectrum of diagnostic tools for assessing liver health.
• Additional methods may include:

1. Imaging Studies:
   • Techniques like ultrasound, CT scans, or MRIs provide detailed images of the liver, aiding in the identification of structural abnormalities, tumors, or cirrhosis.
2. Liver Biopsy:
   • In some cases, a liver biopsy may be recommended to assess the extent of liver damage or confirm a diagnosis.
   • This involves obtaining a small tissue sample for microscopic examination.
3. FibroScan:
   • This non-invasive procedure measures liver stiffness, providing information about liver fibrosis and cirrhosis.
4. Serologic Tests:
   • Specific blood tests can help identify the presence of viruses (such as hepatitis) and autoimmune markers that may affect the liver.

Understanding the limitations and complementary nature of different diagnostic methods ensures a more comprehensive evaluation of liver health. While Liver Function Tests are valuable for routine monitoring and initial assessments, the interpretation of results should be part of a broader clinical picture.

As we conclude our journey through the intricate landscape of liver health, it’s essential to appreciate the role of proactive awareness, regular monitoring, and collaboration with healthcare professionals. Empowered with knowledge, individuals can take charge of their liver health, making informed decisions that contribute to overall well-being.

X. Conclusion

A. Recap of the Significance of Liver Function Tests

• In our exploration of Liver Function Tests (LFTs), we’ve journeyed through the intricate world of the liver, understanding its anatomy, functions, and the vital role it plays in maintaining our overall health.
• Liver Function Tests, comprising a set of markers that reflect the liver’s performance, serve as essential tools in diagnosing, monitoring, and preventing liver diseases.
• From enzymes like ALT and AST to proteins like albumin, these tests provide valuable insights into the health of this remarkable organ.

B. Encouraging Regular Monitoring for Liver Health

• Regular monitoring through Liver Function Tests emerges as a cornerstone of proactive healthcare.
• The liver’s silent nature, coupled with the potential for various risk factors, underscores the importance of routine assessments.
• Incorporating Liver Function Tests into regular health check-ups empowers individuals to detect potential issues early, facilitating timely intervention and lifestyle adjustments.
• Monitoring becomes especially critical for those with risk factors such as alcohol consumption, obesity, or a family history of liver diseases.

C. Final Thoughts on Maintaining a Healthy Liver

• Maintaining a healthy liver involves a holistic approach that spans lifestyle choices, dietary habits, and regular health assessments.
• From embracing a balanced diet and engaging in regular exercise to avoiding excessive alcohol consumption, individuals can actively contribute to the well-being of their liver.
• Understanding the challenges and limitations associated with Liver Function Tests adds depth to their interpretation, allowing for a more nuanced understanding of liver health.

In our collective pursuit of health, let us recognize the liver as a resilient and indispensable organ. By fostering awareness, encouraging regular monitoring, and making informed choices, we pave the way for a healthier future. As we bid farewell to this exploration into liver health, may the insights gained serve as a guide for individuals seeking to prioritize and safeguard the well-being of this vital organ.

Remember, a healthy liver is not only a testament to individual well-being but a cornerstone of overall health and vitality. May your journey toward a healthier liver be marked by informed decisions, proactive measures, and a commitment to lasting well-being.

XI. Additional Resources

I. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Official patient-friendly guides on liver tests and liver diseases.
Website: https://www.niddk.nih.gov

II. World Health Organization (WHO) – Liver Health & Hepatitis Resources
Trusted global guidelines on hepatitis, liver disease prevention and management.
Website: https://www.who.int/health-topics/hepatitis

III. American Liver Foundation (ALF)
Easy-to-understand resources on liver conditions, symptoms, and treatments.
Website: https://liverfoundation.org

IV. Indian Council of Medical Research (ICMR)
Evidence-based national guidelines for liver disease screening and diagnosis in India.
Website: https://www.icmr.gov.in

V. PubMed Health (National Library of Medicine)
Research-backed studies and clinical reviews on liver function tests.
Website: https://pubmed.ncbi.nlm.nih.gov

XII. References

I. Guyton & Hall. Textbook of Medical Physiology – Liver physiology and metabolic functions.
II. Harrison’s Principles of Internal Medicine – Clinical insights on liver diseases and interpretation of LFTs.
III. NIDDK (U.S. Department of Health & Human Services) – Liver test explanations and patient education.
IV. WHO Hepatitis Guidelines – Global standards for liver disease screening and diagnosis.
V. American Liver Foundation – Evidence-based information on liver function tests and liver care.
VI. Journal articles from Hepatology and Journal of Clinical Gastroenterology – Research-driven interpretation of ALT, AST, ALP, bilirubin, and PT.