Ordering Recommendation

Evaluate status of existing liver disease. Monitor treatment in patients with inborn errors of metabolism.

Mnemonic
AMMON
Methodology

Enzymatic

Performed

Sun-Sat

Reported

Within 24 hours

New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
Collect

Green (sodium or lithium heparin). Collect on ice.

Specimen Preparation

Separate plasma from cells and freeze within 15 minutes of draw time. Specimens need to be spun in a refrigerated centrifuge. Transfer 2 mL plasma to an ARUP Standard Transport Tube. (Min: 0.25 mL)

Storage/Transport Temperature

CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.

Unacceptable Conditions

Serum or blood. Non-frozen specimens. Specimens containing oxalate or citrate

Remarks
Stability

After separation from cells: Ambient: Unacceptable; Refrigerated: 2 hours; Frozen: 3 weeks (do not thaw)

Reference Interval

0-14 days: 95 µmol/L or less
15 days-6 years: 68 µmol/L or less
Greater than 6 years: 72 µmol/L or less

Interpretive Data



No compliance statements are in use for this test.

Note
Hotline History
N/A
CPT Codes

82140

Components
Component Test Code* Component Chart Name LOINC
0020043 Ammonia, Plasma 16362-6
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
  • NH3
  • Plasma ammonia level
Ammonia, Plasma