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HelpTest Code NH3V Ammonia, Plasma
Useful For
Assisting in the diagnosis of hepatic coma
Investigating and monitoring treatment for inborn errors of metabolism
Evaluating patients with advanced liver disease
Reporting Name
Ammonia, PSpecimen Type
Plasma EDTAShipping Instructions
Plasma must be separated from cells and frozen within 2 hours of collection. Freeze plasma on dry ice or in a freezer (-60 to -80° C) for long-term storage or shipment.
Specimen Required
Collection Container/Tube: Lavender top (EDTA)
Submission Container/Tube: Plain, plastic screw-top tube
Specimen Volume: 0.5 mL or more
Collection Instructions:
1. Specimens should be put on ice immediately after collection.
2. Centrifuge at refrigerated temperature (4° C).
3. Aliquot plasma into plastic screw-top tube. Keep on ice.
4. Freeze plasma within 2 hours of collection.
Specimen Minimum Volume
See Specimen Collection
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Plasma EDTA | Frozen (preferred) | 7 days | |
| Refrigerated | 2 hours |
Reference Values
≤30 mcmol/L
Day(s) Performed
Monday through Sunday
Report Available
Same day/1 dayPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.CPT Code Information
82140
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| NH3V | Ammonia, P | 16362-6 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| NH3V | Ammonia, P | 16362-6 |
Method Name
Photometric, Bromophenol Blue