What to do when your liver numbers come back high

You squatted heavy Saturday. Your physical was Monday. Thursday an email lands saying your liver enzymes are "slightly elevated, please call the office," and now you're sitting in the school pickup line googling whether you're dying.

Probably not. But the number deserves a real answer instead of a shrug, and the way most people get that answer is by repeating the test wrong and staying confused for another year.

ALT and AST measure leaks, not function

Both are enzymes that live inside cells. When cells get damaged, the enzymes spill into the blood and the lab counts them. That's the whole idea.

ALT (alanine aminotransferase) is concentrated in liver cells. It's the more liver-specific of the two.

AST (aspartate aminotransferase) is in your liver too, but also in skeletal muscle, heart muscle, kidney and red blood cells. Which means AST can climb for reasons that have nothing to do with your liver at all.

Neither one tells you how well your liver is working. That's a different set of numbers — bilirubin, albumin, INR — and doctors look at those when they want to know whether the organ is still doing its job. ALT and AST just tell you something is irritating cells.

The lifting problem nobody warns you about

A hard resistance session damages muscle fibers on purpose. That's the mechanism of getting stronger. It also dumps AST, and a meaningful amount of ALT, into your bloodstream for days afterward. Same with a long run, a hard hike with a pack, or a weekend of moving your mother-in-law's furniture.

So a guy who trains gets a blood draw 48 hours after his heaviest day of the month, and the panel comes back looking like a liver problem when it's actually a hamstring problem.

The tell is creatine kinase. CK is almost entirely a muscle enzyme, and it's not on a standard metabolic panel unless someone asks for it. If your AST and ALT are up and your CK is way up, muscle is the likely source. Ask for it to be added.

Before you repeat the test: take five to seven days off heavy lifting and hard running. Walking is fine. No alcohol in that window. Skip the pre-workout and the creatine loading experiment. Go in fasted if your doctor asks for it, hydrated either way. Then draw again.

If the number drops back into range, you just saved yourself an ultrasound and a month of worrying. If it doesn't, you now have a clean result that actually means something.

"Normal" on your lab sheet is generous

Reference ranges are built from the people who happened to get tested at that lab, and a lot of them had undiagnosed fatty liver. So the upper limit printed on your report — often somewhere in the 40s or 50s — is wider than what clinicians who study this consider genuinely healthy. The American College of Gastroenterology's guidance on abnormal liver chemistries puts the true healthy ceiling for ALT lower than most lab sheets: roughly the low 30s for men, the mid-20s for women.

Practical translation: an ALT of 45 flagged "normal" on your printout isn't automatically nothing. And an ALT of 60 flagged with a big red H isn't automatically a crisis. The number matters less than the trend and the company it keeps.

Ask for the rest of the picture

One enzyme in isolation is a rumor. The panel that turns it into information:

• GGT — rises with alcohol and with bile duct issues. Useful for sorting out why ALP is up.
• ALP (alkaline phosphatase) — points toward the bile ducts rather than the liver cells themselves. Also comes from bone.
• Bilirubin — if this is up and you're yellow in the eyes, that's a same-week conversation, not a next-quarter one.
• Albumin and INR — actual function. Low albumin or a stretched INR means the liver isn't manufacturing properly.
• Platelets — a quietly falling platelet count alongside raised enzymes is one of the earliest hints of scarring.
• Hepatitis B and C serology — hepatitis C screening at least once in adulthood is standard advice now, and plenty of people carrying it have no idea.

There's also a calculation called FIB-4 that uses your age, AST, ALT and platelet count to estimate fibrosis risk. Your doctor can run it in about fifteen seconds. Ask whether it applies to you rather than plugging your own numbers into a website and drawing conclusions at midnight.

The most common real answer is fat, not booze

Fatty liver — the metabolic kind, now usually written as MASLD — is the leading cause of mildly raised ALT in American adults. It travels with belly weight, insulin resistance, high triglycerides and high blood pressure. It's why a 41-year-old who drinks four beers a month can still have a stubborn ALT of 58.

The fix is unglamorous and it works. Weight loss in the range of 3 to 5 percent of body weight reduces fat in the liver. Around 7 to 10 percent is where inflammation and scarring start to improve. For a 220-pound man that's roughly 15 to 22 pounds — over a year, not over Lent.

Resistance training helps liver fat even when the scale barely moves, which is good news if you're 38 with two kids and a commute. Three sessions a week of compound lifting plus enough walking that you're not sitting for eleven hours a day beats an ambitious six-day plan you'll abandon by March. Sustainable beats optimal every single time on this one, because the liver responds to the average of your year, not your best week.

Cut liquid sugar first. Soda, sweet tea, the 400-calorie coffee. It's the single change with the best ratio of effort to result.

Alcohol, supplements and the bottle in the cabinet

If AST is more than roughly twice ALT, that pattern raises the question of alcohol, and your doctor will ask. Answer honestly. Nobody's writing it on a billboard, and a wrong answer buys you an expensive workup chasing the wrong thing.

Standard guidance treats up to two drinks a day for men and one for women as moderate. If your enzymes are up, less is better than moderate, and a dry 60 days is a diagnostic tool as much as a discipline.

Then empty your supplement drawer onto the counter and photograph it. High-dose green tea extract and a long list of bodybuilding and "fat burner" products show up repeatedly in drug-induced liver injury reports. So do some anabolic compounds sold as legal. Acetaminophen is safe at label doses and genuinely dangerous above them, especially stacked with alcohol or hidden in a cold medicine you forgot counts. Bring the actual bottles to the appointment. "Some kind of turmeric thing" isn't a history.

What doesn't wait for the follow-up

Yellow eyes or skin. Dark cola-colored urine with pale stools. Real pain under the right ribs. Swelling in your abdomen or ankles. Confusion or unusual drowsiness. An ALT or AST in the many hundreds or thousands. Any of those, you call today or go in — that's not a "mention it at my annual" list.

Everything else is a retest, a conversation and probably an ultrasound.

This isn't medical advice and I'm not your doctor. It's what to ask yours so the appointment takes twelve minutes instead of three visits.

One more thing: get a copy of the actual numbers, not the summary. "Your labs were fine" isn't a data point you can compare against next year, and next year's comparison is the whole value of testing in the first place.