Skip to main content


Alias: NH3

Discipline: Clinical Chemistry

Test information: To detect elevated concentrations of ammonia in the blood, to help diagnose severe liver disease and certain genetic urea cycle disorders, to investigate changes in consciousness, or to help diagnose hepatic encephalopathy and Reye’s syndrome. Not for GPs to request.

Specimen Type(s)
  • Blood;
Other Acceptable Specimen Type(s)
Specimen Container - Adult
  • Purple Top BD;
Specimen Container - Paediatric
  • N/A;
  • N/A;
Part of a test profile?
Volume (min) of sample to be sent to laboratory
4mls Purple or 1x pink paediatric tube
Patient Preparation, Sample Handling and Transport
Avoid smoking cigarettes prior to collection of the specimen. Collect on ice and deliver to lab immediately.
Maximum add on time
Units and Reference Ranges / Interpretation
RR for both Males and Females
Less than 28 days - <100 + comment “Please note the quoted RR is for term neonates.
For premature neonates use <150 umol/L
Equal to and greater than 28 days - <40 umol/L
UKAS number
UKAS accredited test?

If you have any queries about a test or results interpretation please contact us.

Last updated: 03-05-2024