The Liver Health Checkup: Tests, Who Needs Them, and How Often

Liver disease has quietly become one of the most common chronic conditions in the United States, mostly because fatty liver disease has followed the rise in weight and diabetes. It is also one of the most reversible in its early stages, and one of the least symptomatic. The gap between those two facts is why a routine liver check matters.

Who should be checked

There is no universal liver screening recommendation for healthy adults. Liver enzymes come along with the comprehensive metabolic panel that most people get at a yearly visit, which is a screen in practice if not in name.

Targeted checking is recommended for:

• Anyone with type 2 diabetes or prediabetes
• Anyone who is obese, especially with a large waist
• Anyone with high triglycerides or metabolic syndrome
• Anyone who drinks more than moderate amounts of alcohol
• Anyone who has ever injected drugs, received a blood transfusion before 1992, or has other hepatitis risk
• Anyone on long term medication that can affect the liver, including statins, methotrexate, some antifungals, and high dose acetaminophen
• Anyone with a family history of liver disease or hemochromatosis

The first three groups are large. Between them they cover a majority of American adults over 40.

The tests

Liver enzymes: ALT and AST. On the standard metabolic panel. They signal active injury to liver cells. See liver enzymes explained for ranges and causes. Note that fatty liver can be present with normal enzymes, which is why the next tests exist.

Alkaline phosphatase and bilirubin. Also on the panel. They point toward bile flow problems rather than cell injury.

Albumin and INR. Albumin is a protein the liver makes. INR measures clotting, which depends on liver made factors. Both fall late, when the liver is losing capacity. Normal values are reassuring. Abnormal ones are serious.

Hepatitis B and C screening. Blood tests. The CDC recommends hepatitis C testing once for every adult, and hepatitis B testing once for every adult as of 2023. Both infections are treatable and one is curable, and most people who have them do not know.

FIB-4 score. Not a test, a calculation using age, ALT, AST, and platelet count. All four are on routine panels. It estimates the likelihood of significant scarring. Under 1.3 is low risk. Over 2.67 is high risk. Guidelines now recommend calculating it for everyone with diabetes or obesity. Most people have the inputs on file and have never had it computed.

Ultrasound or elastography. Imaging that sees fat and, with elastography, measures stiffness as a proxy for scarring. Ordered when FIB-4 is intermediate or high, or when enzymes are persistently up.

How often

For adults with none of the risk factors above, the metabolic panel at routine visits is enough.

For adults with diabetes, obesity, or metabolic syndrome, yearly enzymes plus a FIB-4 calculation. Elastography every two to three years if FIB-4 is intermediate.

For anyone with known fatty liver, yearly enzymes and FIB-4, with imaging on the schedule a clinician sets.

For anyone drinking heavily, yearly at minimum, and a conversation about the drinking, which is the treatment.

Hepatitis B and C: once, and again only with new exposure.

What a result starts

Normal everything: carry on. Recheck at the interval above.

Mildly elevated enzymes, first time: repeat in a few weeks without alcohol, new supplements, or heavy exercise beforehand. Most mild elevations normalize.

Persistently elevated enzymes: hepatitis screening, iron studies, medication review, and ultrasound. This is where most fatty liver is diagnosed.

Fatty liver, low FIB-4: the treatment is weight, sugar, and alcohol. A loss of 7 to 10 percent of body weight reverses fat in most people. There are now approved medications for the inflammatory form, but lifestyle remains first line.

Intermediate or high FIB-4: elastography and, often, a hepatology referral. Scarring can still stabilize or improve at this stage. That is the point of catching it here.

Abnormal albumin, INR, or bilirubin: a clinician visit soon, not at the next routine appointment.

The home testing question

Fingerstick liver enzyme tests and mail in hepatic panels exist. They can give a reasonable ALT and AST. They cannot give a platelet count for FIB-4, cannot image the liver, and cannot replace the hepatitis screen, which needs a lab. Use them to track a known condition between visits if a clinician agrees. Do not use them as the yearly check.

The urine strip has two pads that touch on liver function, bilirubin and urobilinogen. They detect a bile problem, not fat or scarring. A positive bilirubin pad is a reason for a same week blood test. A negative one says nothing about fatty liver. See what a 10 parameter dipstick measures.

The short version

If you have diabetes, prediabetes, or carry weight around the middle, ask for your ALT, AST, and platelet count at your next visit and ask what your FIB-4 is. It takes the clinician thirty seconds. It answers the question that matters.