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AMMONIA, PLASMA
Number 230
CPT Code 82140
Alias AMMONIA, PLASMA
Specimen Container Lavender Top
Specimen Type Plasma EDTA
Turn Around Time
Days Performed
Reference Range Males: 27-102 ug/dL; Females: 19-87 ug/dL
Alternate Specimen
Volume 1 mL Plasma
Stability Ambient Not Stable
Stability Refrigerated Not Stable
Stability Frozen 14 Days
Patient Preparation
Patient should be fasting 12-14 hours to avoid lipemia, which interferes with the test.
Methodology
Enzymatic
Limitations
The correlation between blood ammonia levels and hepatic coma is poor. Ammonia determinations are not reliable predictors of impending hepatic coma.
Rejection Criteria
Hemolysis, specimen not received frozen,anticoagulants other than EDTA, lipemia, whole blood
Additional Instructions
Plasma must be separated from red blood cells immediately after draw. Whole blood samples will be rejected.
Performing Laboratory Reference Laboratory
TagsNH3, NH4