An ALT of 159 U/L for women
| Where it fallsthe ACG 2017 upper limits of normal | Markedly raised |
|---|---|
| ALTfor women | 159U/L |
| Usual reference range | up to 25 by ACG 2017U/L |
| Within the ACG normal limit | under 26U/L |
| Mildly raised | 26 – 49U/L |
| Moderately raised | 50 – 124U/L |
| Markedly raisedthis reading | 125 and aboveU/L |
Notes
- A alt of 159 U/L is outside the range a web page should be the end of. Repeat the measurement, and contact a doctor rather than reading further. If it comes with chest pain, breathlessness, confusion, weakness or a change in vision, treat it as an emergency.
- Reference ranges differ between laboratories. The bands above follow the ACG 2017 upper limits of normal. Your own report prints the range its analyser was calibrated against, and that printed range is the one to compare against — a difference of a few units between labs is normal and does not mean either is wrong.
- Your laboratory's printed upper limit is probably higher than the one used here, and that is the point. Most labs still report normal up to about 40–56 U/L, figures derived decades ago from donor populations that included many people with undiagnosed fatty liver. The 2017 American College of Gastroenterology guideline set the true upper limit at 25 U/L for women. A result of 159 U/L can therefore come back unflagged and still sit above the level the specialist guideline considers normal.
- ALT is more specific to the liver than AST. AST also comes from muscle and red cells, so a hard workout, a fall, or a muscle disorder raises AST without the liver being involved. The ratio between them carries information: AST above twice ALT points towards alcohol, while ALT above AST is the usual pattern in fatty liver and viral hepatitis.
- Fatty liver is the common cause of a mildly raised ALT, and it is often the only sign. Weight, waist circumference, triglycerides, HDL and blood sugar are the results to read alongside it, because the same metabolic picture drives all of them.
What alt liver enzyme of 159 U/L means
A reading of 159 U/Lfor women falls in Markedly raised by the ACG 2017 upper limits of normal.
The usual reference range is up to 25 by ACG 2017 U/L.
Reading it next to the rest of the picture
A single figure is a snapshot. What a clinician does with it is set by what sits around it — the other results on the same report, what the person is being treated for, what they were doing in the hours before the sample, and what the previous result was. Two people can hand over the same number and leave with different advice, and neither has been given the wrong answer.
That is also why the bands on this page are drawn from a named guideline rather than from a rounded rule of thumb. A threshold is a decision point somebody argued for in print, not a law of nature, and knowing which document a line comes from is what lets you tell a meaningful result from a borderline one.
Nearby sizes
Read more
- CBC Normal Ranges — What Each Line on the Result MeansA value marked high or low on a CBC is common and is often not significant on its own. The pattern across lines is what a clinician reads.
- eGFR Normal Range: Above 90, and the Stages Below IteGFR is an estimate built from creatinine, age and sex — and the estimate is better than the raw creatinine it comes from, for a reason worth understanding.
- TSH Normal Range: 0.4–4.0 mIU/L, and the Number Moves BackwardsTSH runs opposite to the gland it measures. High TSH means the thyroid is underactive, and that inversion catches almost everyone reading their own result.
- Cholesterol Numbers: What Total, LDL, HDL and Triglycerides MeanA lipid panel reports four numbers and the one printed largest — total cholesterol — is the least useful of them.