A Clear Guide to High ALT in Children for Parents
High ALT in children is a starting point, not a verdict: NASPGHAN advises evaluation when it stays above twice the limit for over 3 months.
Sameer Patel — Founder & Editor
Sameer Patel is the founder and editor of My Medicine Advisor. He is not a doctor or medical professional — before starting this site he worked in banking, and he now researches and edits health information full-time.
He started My Medicine Advisor to make clear, well-sourced health information freely available to anyone. Every article is researched from recognised authorities such as the WHO, CDC, NIH, and NICE, drafted with the help of AI tools, and edited by hand, with sources linked so readers can check them. The calculators on the site use established, published formulas, each one named so you can look it up yourself.
My Medicine Advisor is currently a one-person operation with no clinical review panel, and the site is open about that. If you're a qualified clinician or researcher interested in reviewing content, Sameer would genuinely like to hear from you via the contact page.
The Female ALT Normal Range Is Lower Than Most Labs Show
Female ALT normal range limits on lab reports run 31–55 U/L, while guideline data point far lower. Here's why, and what shifts after 40.
When Alcohol ALT Levels Settle After You Stop Drinking
Alcohol ALT levels settle only as the liver heals. ALT's half-life is about 47 hours, but fatty liver can keep it raised. Here's how to read your retest.
Why Exercise Raises ALT and How Doctors Check the Source
Hard exercise raises ALT because the enzyme also lives in muscle. At the Leadville 100, runners' average ALT jumped from 23 to 117 U/L.
Medications That Raise ALT and How to Know If It Matters
Medications that raise ALT range from Tylenol to supplements, yet the FDA found serious statin liver injury rare. Here's how to tell which rises matter.
Why Fatty Liver Pushes ALT High and What Your Number Signals
Fatty liver and high ALT often travel together, yet ACG sets a healthy ALT at 19–25 IU/L for women—lower than many labs print. Here's what that means.
Normal ALT but Liver Damage Risk You Can Check With FIB-4
A normal ALT can miss liver scarring. Over 65, guidelines use a FIB-4 cutoff of 2.0, not 1.3, because age alone raises the score—here's what yours means.
What a High AST ALT Ratio Can and Can’t Tell You
An AST ALT ratio of 2 or more isn't a drinking verdict: in one study, 64% of heavy drinkers in withdrawal scored 1.0 or lower. Here's what it signals.
Know What an ALT Over 1,000 Means and When to Act Today
An ALT over 1000 runs roughly 30 to 50 times the ACG's healthy range. Here's what usually causes it and why acetaminophen can't wait.
ALT 50 to 100 on Your Lab Report, Explained Clearly
ALT 50 to 100 falls in the ACG's borderline or mild tier. One study found a single weightlifting session kept ALT raised for at least seven days.