All tests · Liver Function (LFTs)
Liver Function (LFTs)
Normal range 15-45 µg/dL (11-32 µmol/L SI). Specimen: Plasma (on ice).
Also known as: NH3, blood ammonia.
Combined adult band. LabVals does not publish separate men's, women's, or pediatric ranges for Ammonia; those can be narrower than the band shown.
| Specimen | Plasma (on ice) |
|---|---|
| Conventional range | 15-45 µg/dL |
| SI range | 11-32 µmol/L |
| Conversion factor | ×0.714 (conventional → SI) |
| Panel | Liver Function (LFTs) |
Convert any Ammonia result between units on the unit converter.
The standard teaching reference range for Ammonia is 15-45 µg/dL in conventional units, or 11-32 µmol/L in SI units. This value is measured in plasma (on ice).
Source: Adult reference values compiled from Pagana & Pagana, Mosby's Diagnostic and Laboratory Test Reference, and Fischbach & Dunning, A Manual of Laboratory and Diagnostic Tests. Reference ranges vary by laboratory, method, age, sex, and population - always use the range printed on the actual result.
Above the range
At the bedside
US labs usually report blood ammonia as ammonia nitrogen (µg N/dL), which is the convention these values follow - 15-45 µg/dL converts at ×0.714 to 11-32 µmol/L. A lab reporting ammonia as NH₃ instead converts at ×0.587 and prints a different band (commonly 10-80 µg/dL ⇔ 6-47 µmol/L). Check which convention your laboratory uses before comparing a result.
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