Jan 8, 2018




Clinical Hub,Tools & Resources,UWHC Lab Test Directory,Chemistry


Ammonia (GM2200) Chemistry Lab Test

Name: Ammonia

Test Name: Ammonia

Health Link Test Code: GM2200

LIS Test Code: NH3

CPT Code(s): 82140

Methodology: Glutamate Dehydrogenase

Days Performed: Daily, 24 hours.

Stat In-Lab Turnaround Time: 1 hour.

Specimen: Blood

Collection Container: Green top

Also Acceptable: Green cap with yellow ring (PST)

Collection Instructions:

Fill tube completely.

Collection Volume: 4 mL

Pediatric Collection Volume: 1 mL

Stability Refridgerated:

2 hours

Stability Frozen:

3 weeks

Sample Analyzed: Plasma

Testing Volume: 0.5 mL

Pediatric Testing Volume: 0.2 mL

Specimen Processing:

Centrifuge with cap in place. Redraw specimen if hemolysis is present. Transfer cell-free plasma to plastic vial. Freeze specimen.

Specimen Transport:

Transport specimen to laboratory immediately. Whole blood specimen must arrive in the laboratory within 30 minutes of collection if not on ice pack. If in question, transport on ice pack. Transport frozen plasma on dry ice if coming from clinic location.

Unacceptable Criteria:

Hemolyzed specimens are not acceptable. Ice packed specimens greater than 60 minutes old or specimens not on ice pack greater than 30 minutes old when received by laboratory are not acceptable.


 Age:  umol/L
0-14 days 21-95
15 days-5 years 16-68
6 years and up  <72

Interpretation Type: Reference Interval

Critical Calls: yes