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Test Code LAB47 Ammonia (NH3)

Department

CHEMISTRY

Collection Requirements

Collect in pre-chilled tube and place on ice immediately.
Centrifuge within 20 minutes of draw.

Primary Collection Container

Lavender 6 mL (K3EDTA)

Transport

Plasma Frozen

Preferred Transport Temperature

Frozen

Processing

Centrifuge within 20 minutes of draw. Aliquot plasma and freeze.

Stability

Whole blood:
Ambient: Unacceptable
Refrigerated: 30 minutes
Frozen: Unacceptable

Plasma:
Ambient: Unacceptable
Refrigerated: 2 hours
Frozen: 3 days

Minimum Testing Volume

0.5 mL

Reference Range

0-1 wks 70-115 µmol/L

1 wks-4 wks 27-62 µmol/L

4 wks 19-42 µmol/L

Methodology

Roche c503 enzyme immunoassay

Performed

Sunday – Saturday

Reported

Varies

CPT Codes

82140

Unacceptable Conditions

Delay in testing.

Gross hemolysis.