Home
HelpTest Code NH3 Ammonia
Additional Codes
| Epic Ordering Code | LAB47 |
| NBS code | LBC03825 |
| Service code | 31929 |
Specimen Requirements
Submit the following immediately:
| Container: |
| Green Top (Li Heparin) |
Place specimen in ice and send to the laboratory immediately.
Processing Requirements
Spin the sample using a refrigerated centrifuge within 15 mins of collection.
Specimen type: Plasma
Volume: 0.5 mL
Storage/transport requirements: Refrigerated
Specimen Stability
| Specimen Type | Plasma |
|---|---|
| Ambient | Reject |
| Refrigerate | 2 hours (plasma separated from cells) |
| Frozen | Reject |
Specimen Condition
| Gross Haemolysis | Alert/Reject |
|---|---|
| Icterus | Alert/Reject |
| Lipaemia | Alert/Reject |
| Others | Not applicable |
Methodology
Enzymatic Assay
Days and Times Performed
24 hrs, TAT 1 day
Reference Interval
18 – 72 umol/L
Critical value: > 100 umol/L
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Assessment of liver function.
Paediatrics: Screening test for amino acid disorders, organic acid disorders and urea cycle disorders.
Update
Updated on 26/05/2026
LOINC Code Information
16362-6