Test Overview
Test Methodology

Enzymatic Glutamate Dehydrogenase Assay

Test Usage

Liver function test

Reference Range *

11 - 60 umol/L

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Daily, 24 hours
Analytic Time

1 hour

Soft Order Code
AMMO
MiChart Code
Ammonia
Synonyms
  • NH4
  • AMMONIA LEVEL
  • AMMONIA
  • AMMO
Laboratory
Chemical Pathology
Section
Automation
STAT Availability

STAT requests for this test will be performed on a STAT basis (supervisory staff approval is not required).

Specimen Requirements
Collection Instructions

Collect specimen in a lavender top tube; place on ice immediately after collection. Keep specimen cold and do not remove stopper until ready to aliquot. Do not freeze. Centrifuge, aliquot plasma into a plastic tube and freeze within 30 minutes of collection. Micro containers (samplettes) and heal sticks are not acceptable specimens. Grossly lipemic, hemolyzed and/or icteric samples are not acceptable for analysis.

Special Handling

Place on ice immediately. Must arrive in lab within 15 minutes or aliquot and freeze within 30 minutes. DO NOT FREEZE WHOLE BLOOD SPECIMEN.

Alternate Specimen
None
Lavender Top Tube
Normal Volume
0.5 mL EDTA plasma
Minimum Volume
0.25 mL EDTA plasma
Additional Information

Blood ammonia increases rapidly at room temperature; keep specimen cold at all times; do not freeze.

Billing
CPT Code
82140
Fee Code
20723
LOINC
16362-6
Resources