{"id":3556,"date":"2026-10-08T19:24:56","date_gmt":"2026-10-08T11:24:56","guid":{"rendered":"http:\/\/www.mediatebinst.com\/blog\/?p=3556"},"modified":"2026-10-08T19:24:56","modified_gmt":"2026-10-08T11:24:56","slug":"what-are-the-common-laboratory-tests-for-liver-function-4a0b-8d08d2","status":"publish","type":"post","link":"http:\/\/www.mediatebinst.com\/blog\/2026\/10\/08\/what-are-the-common-laboratory-tests-for-liver-function-4a0b-8d08d2\/","title":{"rendered":"What are the common laboratory tests for liver function?"},"content":{"rendered":"

If you\u2019ve ever had a routine blood work panel at a primary care provider\u2019s office, odds are good that part of that report will include liver function tests\u2014often abbreviated as LFTs, though you might also see them referred to as hepatic function panels. For anyone involved in healthcare delivery, whether as a provider, practice manager, or someone working behind the scenes to get those tests to patients, liver function testing is a cornerstone of diagnostics. As someone who works in laboratory testing supply, I\u2019ve seen firsthand how these tests go far beyond a simple \u201ccheckup\u201d marker: they help catch chronic disease, monitor treatment effectiveness, and even spot acute issues before symptoms set in. Today, I want to walk through the most common liver function tests, what they tell us, and why getting these tests right matters for every step of the care journey\u2014from patient to lab to provider. Laboratory Testing<\/a><\/p>\n

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First, it\u2019s important to ground this in what the liver actually does, because that context makes the tests make sense. The liver is a 3-pound, multifunctional organ that acts like the body\u2019s filter, factory, and storage unit all in one. It processes nutrients from food, breaks down medications and toxins (like alcohol or chemicals), makes proteins that help blood clot, and clears waste products from the bloodstream. When the liver is damaged\u2014from things like fatty liver disease, viral hepatitis, alcohol overuse, or prescription medications\u2014it doesn\u2019t work as it should, and the levels of certain substances in the blood shift as a result. That\u2019s where liver function tests come in: they measure these shifts to give a snapshot of liver health.<\/p>\n

Let\u2019s start with the enzymes that leak out when liver cells are injured. The first two, alanine transaminase (ALT) and aspartate transaminase (AST), are the most well-known of the LFTs. ALT is almost exclusively found in liver cells, so elevated ALT levels are a specific red flag for liver damage. AST, on the other hand, is present in several organs\u2014including the heart, muscles, and kidneys\u2014so an elevated AST might point to liver damage, but it could also signal a heart attack or muscle injury. When both ALT and AST are high, that\u2019s what providers look for as a sign of hepatic issue; the ratio of AST to ALT can also give clues about what\u2019s causing the damage. For example, a very high AST-to-ALT ratio is common in alcoholic liver disease, while a higher ALT than AST is typical of non-alcoholic fatty liver disease (NAFLD). As a lab supply provider, I know how critical it is that these enzyme tests are accurate, because a wrong reading could lead to a misdiagnosis or a delay in care for patients who need it most.<\/p>\n

Next up are tests that measure how well the liver is doing its job of making proteins. The liver produces a protein called albumin, which keeps fluid from leaking out of blood vessels, transports hormones and medications, and helps the body heal. Low albumin levels don\u2019t just signal liver problems\u2014they can also be a sign of kidney disease, malnutrition, or chronic inflammation\u2014but when paired with other LFT results, it becomes a key piece of the puzzle. Another protein made by the liver is prothrombin, which helps with blood clotting. The prothrombin time (PT) test, and its cousin the international normalized ratio (INR) that standardizes results across labs, measures how long it takes blood to clot. If the liver isn\u2019t making enough prothrombin, PT and INR will be prolonged. This is especially important for providers monitoring patients with acute liver injury, because a very prolonged PT is a sign of severe liver damage that could lead to liver failure. I\u2019ve had clients tell me how vital it is that their PT\/INR tests are precise, because it guides decisions about whether a patient needs urgent care or a liver transplant.<\/p>\n

Then there are the bilirubin tests, which track waste products the liver clears from the body. Bilirubin is a byproduct of old red blood cells; the liver takes this bilirubin, processes it, and excretes it into bile, which is then released into the intestines. There are two types of bilirubin: unconjugated (indirect) bilirubin, which is the unprocessed form, and conjugated (direct) bilirubin, which is processed by the liver. A total bilirubin test measures both, and direct bilirubin is measured separately. Elevated total bilirubin can cause jaundice\u2014the yellowing of the skin and eyes that people often associate with liver problems. But high bilirubin can also be caused by issues with red blood cells breaking down too quickly (like in hemolytic anemia) or problems with bile ducts, not just liver damage. For example, if direct bilirubin is high, that might mean bile ducts are blocked (from a gallstone, for instance), while high indirect bilirubin is more likely from red blood cell issues. This is another test that requires careful handling in the lab, because even small errors in processing samples can throw off bilirubin levels and lead to unnecessary follow-up tests for patients.<\/p>\n

Beyond these basic tests, there are more specific liver function tests that providers order when they need more detail, especially if a patient has abnormal results on their initial panel or a known liver condition. One group is the alkaline phosphatase (ALP) tests. ALP is an enzyme found in the liver, bile ducts, and bones, so elevated levels can point to issues with the bile ducts (like obstruction from a gallstone or cirrhosis) or bone disease. When ALP is high, providers often order a separate test for gamma-glutamyl transferase (GGT) to confirm that the high ALP is coming from the liver and not the bones, since GGT is more specific to the liver and bile ducts. I\u2019ve found that providers rely on GGT a lot when they\u2019re trying to figure out if elevated ALP is related to liver damage, and it\u2019s also a useful marker for monitoring alcohol use in patients with liver disease.<\/p>\n

Another key set of tests are viral hepatitis serologies, which are actually liver function-related tests because viral hepatitis is one of the leading causes of liver damage worldwide. Hepatitis A, B, and C are the most common types, and each has different serology markers: for example, hepatitis B surface antigen (HBsAg) means a person is currently infected with hepatitis B, while anti-HCV antibodies indicate past or current hepatitis C infection. These tests don\u2019t just measure liver function directly, but they are critical for identifying the cause of abnormal LFTs and guiding treatment. As a lab supply partner, we work with labs and healthcare providers to ensure they have access to accurate, reliable serology tests, because early detection of viral hepatitis can prevent chronic liver disease and save lives.<\/p>\n

I also want to mention how liver function tests are used beyond diagnosis\u2014they\u2019re a key tool for monitoring treatment and disease progression. For example, patients with chronic hepatitis C who are on antiviral medications will have LFTs done regularly to see if their liver enzymes are returning to normal and if the virus is being cleared. Patients with NAFLD or alcoholic liver disease will have their LFTs monitored to track if lifestyle changes are working. Even patients taking medications that can be toxic to the liver, like some cholesterol drugs or chemotherapy, will have LFTs checked periodically to catch damage early before it becomes serious. This ongoing monitoring is why consistent, high-quality liver function tests are so important\u2014patients count on regular results to keep them on track with their care.<\/p>\n

Now, I know that behind every test is a story: a patient who\u2019s been living with undiagnosed liver disease for months, a provider who needs clear, actionable results to make a treatment decision, a lab team that\u2019s relying on accurate reagents to get those results right. As someone in the laboratory testing supply industry, I see that every day. It\u2019s not just about selling tests or reagents\u2014it\u2019s about being a partner that helps labs deliver reliable results so providers can care for their patients. That\u2019s why we prioritize quality, accuracy, and timely delivery because we know that when your lab has the right tools, you can focus on what matters most: patient outcomes.<\/p>\n

Whether you\u2019re a clinic building your routine care panels, a hospital needing reliable testing for complex cases, or a lab looking for a supply partner you can trust, the common liver function tests I\u2019ve outlined here are the foundation of liver health diagnostics. From ALT and AST to albumin, bilirubin, and beyond, each test plays a unique role in painting a picture of how the liver is working, and together they give providers the information they need to guide care.<\/p>\n

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If you\u2019re a healthcare provider, lab manager, or practice administrator looking to streamline your LFT testing, ensure you have access to consistent, accurate reagents and panels, or have questions about the latest in liver function diagnostics, we\u2019re here to help. Reach out to our team to discuss your specific needs, whether you\u2019re stocking routine panels or need specialized tests for complex cases. We work closely with labs and healthcare facilities to provide tailored solutions that fit your workflow and quality standards.<\/p>\n

Certification and Compliance<\/a> References<\/p>\n

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  1. American Association for the Study of Liver Diseases. (2021). Evaluation of abnormal liver enzymes in adults. Clinical Practice Guidelines.<\/li>\n
  2. Kim, W. R., et al. (2020). Liver function tests: A practical approach for primary care. Mayo Clinic Proceedings, 95(4), 782-794.<\/li>\n
  3. Centers for Disease Control and Prevention. (2022). Viral hepatitis testing guidelines. Division of Viral Hepatitis.<\/li>\n
  4. European Association for the Study of the Liver. (2019). EASL clinical practice guidelines on non-alcoholic fatty liver disease. Journal of Hepatology, 70(2), 300-332.<\/li>\n<\/ol>\n
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    Verittek Standards Co., Ltd.<\/a>
    As a professional laboratory testing service provider in China, we help clients improve overall product quality and stability by providing third-party inspection services. If you have any enquiry about cooperation, please feel free to email us.
    Address: Room 1002, Building 1, Tian’an Industrial Building, Panyu Energy Saving Technology Park, No.555 North Panyu Avenue, Donghuan Street, Panyu District, Guangzhou City, China.
    E-mail: sales@verittek.com
    WebSite:     https:\/\/www.verittek.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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