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Ammonia
MessageChemistry
Test Code
LAB47
Alias/See Also
NH3
CPT Codes
82140
Includes
Ammonia
Preferred Specimen
Light green top tube (lithium heparin plasma)
FULL TUBE, ON ICE; DELIVER TO CHEMISTRY
IMMEDIATELY.
FULL TUBE, ON ICE; DELIVER TO CHEMISTRY
IMMEDIATELY.
Minimum Volume
Whole blood: 600 uL (one full light-green-top microtainer or two full red-top microtainers).
Serum/plasma: 300 uL plasma.
Serum/plasma: 300 uL plasma.
Other Acceptable Specimens
Serum should not be used for ammonia measurements because ammonia is produced during the clotting process.
Instructions
Collect specimen and keep on ice.
LAB: DO NOT remove stopper. Centrifuge and ANALYZE PROMPTLY.
Separate and remove plasma from the cells within 15 minutes of collection. If not analyzed immediately, refrigerate for up to three hours or Frozen: 24 hours.
LAB: DO NOT remove stopper. Centrifuge and ANALYZE PROMPTLY.
Separate and remove plasma from the cells within 15 minutes of collection. If not analyzed immediately, refrigerate for up to three hours or Frozen: 24 hours.
Transport Temperature
On ice
Specimen Stability
Keep specimen on ice
Ambient: less than 2 hours
Referigerated: 3 hours
Frozen: 24 hours
Ambient: less than 2 hours
Referigerated: 3 hours
Frozen: 24 hours
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolyzed, contaminated, not enough volume
FDA Status
Approved
Setup Schedule
Everyday
Report Available
Same day
Limitations
Glucose at 600 mg/dL (33.3 mmol/L) can cause a decrease of 8 to 40 μmol/L in ammonia concentration
Reference Range
9 - 30 umol/L
Performing Laboratory
Hoag Newport/ Hoag Irvine