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Ammonia, Plasma

Ordering Recommendation
Screening test to evaluate kidney function.
Methodology
Enzymatic Assay
Performed
Mon-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:
Allow specimen to clot completely at room temperature. Separate serum or plasma from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to a Standard Transport Tube. (Min: 0.2 mL)
Storage/Transport Temperature:
Refrigerated.
Unacceptable Conditions:
Specimens containing sodium fluoride.
Remarks:
Stability:
After separation from cells: Ambient: 1 week; Refrigerated: 1 week; Frozen: 1 year
Reference Interval
Refer to Report
Interpretive Data
Note
CPT Code
84520
Components
Component Test Code
Component Chart Name
LOINC
0020023
Urea Nitrogen, Serum or Plasma
3094-0
Aliases

Urea Nitrogen Clearance
Blood Urea Nitrogen
BUN

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