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Ammonia, Plasma
MessageSpecimen must arrive within 15 minutes of draw.
Test Code
203
CPT Codes
82140
Preferred Specimen
Green-top (heparin) tube
Minimum Volume
Full tube
Instructions
Place specimen on wet ice immediately after drawing and keep refrigerated until centrifugation. Use refrigerated centrifuge.
Venipuncture should occur prior to sulfasalazine administration due to the potential for falsely elevated results.
Venipuncture should occur prior to sulfapyridine administration due to the potential for falsely depressed results.
Venipuncture should occur prior to sulfasalazine administration due to the potential for falsely elevated results.
Venipuncture should occur prior to sulfapyridine administration due to the potential for falsely depressed results.
Transport Temperature
Refrigerated
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Specimens must arrive to the lab on ice and within 15 minutes of draw time. Specimens will be rejected if analysis cannot be started 30 minutes from draw time.
Methodology
Glutamate Dehydrogenase Enzymatic
Setup Schedule
Monday through Sunday
Reference Range
1-30 days: <50 µmol/L
>=31 days: <33 µmol/L
Critical values (automatic call-back):
Infants <1 month: >125 µmol/L
Adults: >60 µmol/L
>=31 days: <33 µmol/L
Critical values (automatic call-back):
Infants <1 month: >125 µmol/L
Adults: >60 µmol/L
Clinical Significance
Ammonia is an end product of metabolism found in small amounts in the blood. Elevated levels are found in patients with impaired liver function.
Performed By
CoxHealth
