Specimen:

Plasma

Collection Medium:

Alternate
Collection Media:

Call laboratory for additional acceptable specimen collection 
containers.

Minimum:

2 ml whole blood in light green top tube or 2 microtubes for pediatric 
patients

Testing Schedule:

24 hrs/day, 7 days a week, including holidays.

Analytic Time:

2 hours (upon receipt in laboratory)

Reference Range:

Male   8-61 u/l
Female 5-36 u/l

Comments:

Elevated by drugs such as Phenobarbital and Dilantin.  See reference 
range change.

Test
Limitations:

Criterion: Recovery within plus or minus 10% of initial value.

Icterus: No significant interference up to an I index of 20 mg/dl for 
unconjugated bilirubin (approximate unconjugated bilirubin 
concentration:20 mg/dl).

Hemolysis: No significant interference up to an H index of 200 mg/dl 
(approximate hemoglobin concentration: 200 mg/dl).

Lipemia (Intralipid): No significant interference up to an L index of 
1000 mg/dl (approximate triglycerides concentration: 2000 mg/dl).There 
is poor correlation between turbidity and triglycerides concentration.

Reference:
Glick MR, Ryder KW, Jackson SA. Graphical Comparisons of Interferences 
in Clinical Chemistry Instrumentation. Clin Chem 1986;32:470-474.

Methodology:

Enzymatic

CPT Code:

82977