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Liver

ALT: Normal Values and What a High ALT Means

ALT is a key liver enzyme that provides valuable insight into your liver health. Regular monitoring helps detect potential liver issues early, supporting proactive health management.

Doctor's Assessment Included

Reference Ranges

See the value that applies to you:

Choose male or female — this range differs by sex.

Enter your age — this range changes with age.

This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.

Your reference range
u/l
8 71 u/l
Reference ranges by group, in u/l
Male · 1–5 years 9–35 u/l
9 35
Male · 6–12 years 10–35 u/l
10 35
Male · 13–18 years 9–42 u/l
9 42
Male · 19–50 years 13–71 u/l
13 71
Male · 51–65 years 13–64 u/l
13 64
Male · 66–80 years 11–54 u/l
11 54
Male · 81 years and older 9–42 u/l
9 42
Female · 1–5 years 10–33 u/l
10 33
Female · 6–12 years 9–33 u/l
9 33
Female · 13–18 years 8–35 u/l
8 35
Female · 19–50 years 9–44 u/l
9 44
Female · 51–65 years 11–52 u/l
11 52
Female · 66–80 years 10–46 u/l
10 46
Female · 81 years and older 8–37 u/l
8 37
8 71 u/l

Source: NVKC Reference population: Nederlandse huisartsenpopulatie (NUMBER, n=7.574.327)

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

What It Measures

ALT is an enzyme found predominantly in liver cells. When liver cells are damaged or inflamed, ALT is released into the bloodstream, causing levels to rise.

This test measures the concentration of ALT in your blood. Because ALT is more specific to the liver than other enzymes like AST, it is considered one of the most reliable markers of liver health.

Why It Matters

ALT levels provide important insight into liver function. Elevated levels may indicate conditions such as hepatitis, fatty liver disease, or medication-related liver damage.

Early detection of elevated ALT can help identify liver problems before symptoms develop, allowing for timely intervention and lifestyle modifications.

When to Test

Testing may be recommended as part of routine health screening, when liver disease is suspected, or when taking medications that may affect the liver.

Regular monitoring may also be appropriate for individuals who consume alcohol regularly, have a history of liver disease, or are managing conditions such as obesity or diabetes.

Symptoms

Low Levels

Low ALT levels are generally not a cause for concern and typically indicate normal liver function.

High Levels

Fatigue and weakness
Abdominal pain or discomfort, particularly in the upper right area
Jaundice (yellowing of skin or eyes)
Dark urine
Nausea or loss of appetite

Recommendations

Male

If Low

Normal ALT indicates healthy liver function. Maintain a balanced diet and moderate alcohol consumption.

If High

Elevated ALT may indicate liver cell damage. Consider reducing alcohol intake, reviewing medications, and consulting your healthcare provider for liver evaluation.

Female

If Low

Normal ALT indicates healthy liver function. Maintain a balanced diet and moderate alcohol consumption.

If High

Elevated ALT may indicate liver cell damage. Consider reducing alcohol intake, reviewing medications, and consulting your healthcare provider for liver evaluation.

Lifestyle Tips

Limit alcohol consumption, as excessive intake is a common cause of elevated ALT levels. Maintain a healthy weight through balanced nutrition and regular exercise, as non-alcoholic fatty liver disease is increasingly common.

Review all medications and supplements with your healthcare provider, as some may affect liver function. Stay well hydrated and include liver-supportive foods such as leafy greens, cruciferous vegetables, and foods rich in antioxidants.

Frequently Asked Questions

What causes elevated ALT levels?
Common causes include fatty liver disease, hepatitis, excessive alcohol consumption, certain medications, and obesity. Intense exercise can also temporarily raise ALT levels.
Can ALT levels return to normal?
Yes, in many cases ALT levels can normalize with lifestyle changes such as reducing alcohol intake, losing weight, or adjusting medications. Consult your healthcare provider for personalized guidance.
How often should ALT be tested?
The frequency depends on your individual risk factors. For routine screening, annual testing may be sufficient. If you have known liver conditions or take hepatotoxic medications, more frequent monitoring may be recommended.

Test Products

This marker is included in the following test panels.

InsideTracker

A 36-biomarker performance and longevity panel inspired by InsideTracker Ultimate — covering heart, hormones, metabolism, inflammation, recovery and iron status.

SHBG (Sex Hormone Binding Globulin) TSH (Thyroid Stimulating Hormone) ALT (Alanine Aminotransferase) LDL Cholesterol GGT (Gamma-Glutamyl Transferase) Cortisol DHEA-S Estradiol (E2) Free Testosterone Total Testosterone Folate (Folic Acid) Vitamin B12 Calcium Ferritin Iron (Serum) Magnesium Magnesium (Intracellular) Potassium Progesterone Sodium Transferrin CRP (C-Reactive Protein) Glucose (Fasting) HbA1c (Glycated Hemoglobin) ApoB (Apolipoprotein B) HDL Cholesterol Total Cholesterol Albumin AST (Aspartate Aminotransferase) Vitamin D (25-OH) Insulin (Fasting) Leukocyte Differential Creatine Kinase (CK) Transferrin Saturation Triglycerides Basic Blood Count
€399,-

Whoop

A 44-biomarker comprehensive health panel inspired by WHOOP Advanced Labs — a deep look at metabolism, cardiovascular risk, hormones, liver, kidney and inflammation.

SHBG (Sex Hormone Binding Globulin) TSH (Thyroid Stimulating Hormone) ALT (Alanine Aminotransferase) LDL Cholesterol Cortisol DHEA-S Estradiol (E2) Free Testosterone FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) Total Testosterone Bicarbonate Calcium Chloride Ferritin Iron (Serum) Magnesium Potassium Sodium Transferrin CRP (C-Reactive Protein) Homocysteine Glucose (Fasting) HbA1c (Glycated Hemoglobin) ApoB (Apolipoprotein B) HDL Cholesterol Omega-3 Index Total Cholesterol Albumin HOMA-IR ALP (Alkaline Phosphatase) AST (Aspartate Aminotransferase) Bilirubin (Total) Total Protein Urea (BUN) Creatinine Vitamin D (25-OH) eGFR (Estimated Glomerular Filtration Rate) Insulin (Fasting) Leukocyte Differential Transferrin Saturation Lipoprotein(a) Triglycerides Basic Blood Count
€499,-

ALT (Alanine Aminotransferase)

€8,-