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HelpCatalog ID Ammonia Ammonia
CPOE Test Name
Ammonia
Synonyms
NH4, NH3
Specimen Type
Plasma
Specimen Requirements
4 mL Dark Green-top (sodium heparin) tube
Causes for Rejection
Wrong container; hemolysis; not transported on ice;
specimen not received immediately after collection; improper labeling; insufficient quantity
Turn Around Time
Urgent/Emergent: 1 hr.
CPT / HCPCS Code
82140
Performing Lab
Core Laboratory, AD 3301 721-2120
Storage and Transport
Put on ice, transport immediately.
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
EPIC EAP Test Code
LAB47