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Catalog ID Ammonia Ammonia

CPOE Test Name

Ammonia

Synonyms

NH4, NH3

Specimen Type

Plasma

Specimen Requirements

4 mL Dark Green-top (sodium heparin) tube

Storage and Transport

Put on ice, transport immediately.

Causes for Rejection

Wrong container; hemolysis; not transported on ice;

specimen not received immediately after collection; improper labeling; insufficient quantity

Special Instructions

The vendor states that the ammonia assay may be affected by cigarette smoking by either the patient or the specimen collection staff.

There is a significant positive bias with new Ammonia testing methodology which began Nov 6th, 2018. Results released after this date have approximately a 35% increase as compared to previous Ammonia results. Please take this change into consideration when interpreting these results.

Reference Values

 

0-3 days of age        10 - 107 umol/L

3 - 14 days of age      10 - 92 umol/L

15 days of age - 150 years      10 - 50 umol/L

Critical Values

0-3 days of age   critical high ≥ 108 umol/L

4 days of age and older   critical high ≥ 100 umol/L

Performing Lab

Core Laboratory, AD 3301 721-2120

Turn Around Time

Urgent/Emergent: 1 hr.

CPT / HCPCS Code

82140