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MedicalVideos.com — Lab Values
Liver Function Tests reference sheet. Typical adult ranges; ranges vary by laboratory — always compare a result with the range on the patient’s own report.
Liver Function Tests reference sheet. Typical adult ranges; ranges vary by laboratory — always compare a result with the range on the patient’s own report.
Liver Function Tests — Reference Ranges
Liver function tests are a group of blood tests that reflect how the liver is working and whether liver cells or the bile ducts are irritated. Individual results are rarely interpreted alone — the pattern across the group, and how it changes over time, is what matters.
This page lists all 12 tests in this group with their typical adult ranges in both unit systems. Open any test for plain-language notes on high and low results and how to prepare.
| Test | Abbr. | Typical range (conventional) | Typical range (SI) |
|---|---|---|---|
| 5'-Nucleotidase | 5'-NT | 0–11 U/L | 0–11 U/L |
| Alanine Aminotransferase | ALT | 7–56 U/L | 7–56 U/L |
| Alkaline Phosphatase | ALP | 40–130 U/L | 40–130 U/L |
| Alpha-1 Antitrypsin | AAT | 100–200 mg/dL | 20–38 µmol/L |
| Ammonia | — | 15–45 µg/dL | 11–32 µmol/L |
| Aspartate Aminotransferase | AST | 10–40 U/L | 10–40 U/L |
| Bilirubin, Direct | — | 0.0–0.3 mg/dL | 0–5 µmol/L |
| Bilirubin, Indirect | — | 0.2–0.8 mg/dL | 3–14 µmol/L |
| Bilirubin, Total | — | 0.3–1.2 mg/dL | 5–21 µmol/L |
| Gamma-Glutamyl Transferase | GGT | Male 8–61; Female 5–36 U/L | Male 8–61; Female 5–36 U/L |
| Lactate Dehydrogenase | LDH | 140–280 U/L | 140–280 U/L |
| Prealbumin | — | 20–40 mg/dL | 200–400 mg/L |
Full, always-updated version of this sheet: https://www.medicalvideos.com/lab-values/panel/liver/Printed from MedicalVideos.com Lab Values. Educational reference only — not medical advice.
Please note: Reference ranges vary between laboratories, and between the methods and instruments they use — the range printed on your own report is the one your result should be compared with. A result outside the range is not by itself a diagnosis, and a result inside it does not rule out illness. These pages are an educational summary, not medical advice: always discuss your results with the clinician who ordered them, who can interpret them in the context of your health and history.