Your Liver Enzymes Came Back High: Do You Need to See a Doctor?

"Liver enzymes" usually refers to AST and ALT, two of the substances measured on a liver panel. According to MedlinePlus (National Library of Medicine), AST is found mainly in the liver but also in the heart, muscles and other tissues, so a high AST is not specific to the liver alone. A provider often orders these alongside ALT, and high levels of AST and/or ALT may mean there is some type of liver damage.

There is no single explanation for a high number. The American Academy of Family Physicians reports that the most common causes of mildly elevated ALT and AST are nonalcoholic fatty liver disease and alcoholic liver disease, and that hepatitis B or C, the inherited condition hemochromatosis, and certain medicines and over-the-counter supplements can also raise enzymes. MedlinePlus lists a wider range of possibilities, including mononucleosis, pancreatitis, heart problems or procedures, seizures, deep burns and recent surgery.

Some high results do not reflect disease at all. MedlinePlus notes that results outside the normal range do not always mean a condition needing treatment, and that pregnancy, exercise, certain medicines, and age or sex can affect them. The test also typically calls for fasting for up to 12 hours beforehand, so how the sample was taken can matter.

This is why the number on your portal cannot interpret itself. Your clinician compares all the substances on the panel — albumin, total protein, ALP, ALT, AST, GGT, bilirubin, LDH and prothrombin time — looking for patterns. MedlinePlus advises asking the provider who ordered the test to explain what your results mean, because reading them is often complicated. Book that conversation with the ordering clinician before you draw conclusions.

• Call the office that ordered the test within 1 to 2 weeks if you have no symptoms and the result was flagged high on a routine panel. Ask for a phone or in-person follow-up, not just a portal message.
• If that 1 to 2 week window passes with no contact, the result commonly stays in your chart as an unresolved flag: no repeat test is ordered, nobody sees whether the number is rising, falling or steady, and a treatable cause such as a supplement or a viral hepatitis goes unlooked-for. The result is not re-flagged automatically.
• Within 1 to 2 weeks, also if the test was ordered because of a known risk — family history of liver disease, alcohol use disorder, obesity, diabetes, medicines that can affect the liver, or hepatitis exposure — since MedlinePlus lists these as reasons to test even without symptoms.
• Same-week appointment, primary care or urgent care, if the result came back high and you have ongoing nausea and vomiting, loss of appetite, itching, or abdominal pain or swelling.
• Bring a full list of prescriptions, over-the-counter medicines and supplements to that visit. The American Academy of Family Physicians notes the clinician will ask questions, examine you, may order further blood tests, and may use a liver ultrasound to help find a cause.
• Expect a repeat test. If no cause is found or levels stay up, further testing, a specialist referral, or a liver biopsy may follow.

These are observable changes. Any one of them moves you off the routine timeline.

• Yellowing of the skin or the whites of the eyes (jaundice) — call your clinician the same day; if the office is closed, go to urgent care or an ER rather than waiting for the next business day.
• Urine that has turned dark brown or tea-colored, or stools that have turned pale, clay-colored or light — same-day call, ER if after hours.
• New swelling of the abdomen, or new swelling in both ankles and legs that leaves a dent when pressed — same-day call; ER if it comes with breathlessness.
• Vomiting blood, or black tarry stools — go to an ER now; call 911 if you also feel faint or cannot stand.
• Vomiting that has stopped you keeping fluids down for more than 24 hours — urgent care or ER for assessment.
• Confusion, slurred speech, unusual drowsiness, or someone cannot wake you fully — call 911.
• Abdominal pain with a measured fever of 100.4°F or higher — same-day care, ER if the pain is severe enough that you cannot stand upright.
• You took more than the label amount of any over-the-counter pain or cold medicine, or a new supplement, in the past 24 hours — call Poison Control or go to an ER; MedlinePlus lists drugs toxic to the liver, especially alcohol, among causes of high AST.

If a cause is already known, these signs still need assessment — do not assume they are explained.

1. Which enzymes were high — AST, ALT, or both — and how far above this lab's upper limit?
2. Was ALT higher than AST, or the other way round, and what does that pattern suggest here?
3. What did the rest of the panel show — bilirubin, ALP, albumin and prothrombin time?
4. Could any medicine or supplement on my list explain this result?
5. Did my fasting, recent exercise, or a recent illness affect this draw?
6. Should I be tested for hepatitis B or C, or for hemochromatosis?
7. Do I need a liver ultrasound, and when?
8. When should the test be repeated, and who orders it?
9. What enzyme level or pattern would make you refer me to a specialist?
10. Is there an amount of alcohol you want me to stay under before the repeat test?
11. Which specific change would mean I should call you rather than wait for the repeat?