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 1 microtube for pediatric 
patients

Testing Schedule:

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

Analytic Time:

2 hours (upon receipt in laboratory)

Reference Range:

Males: 40-129 u/l; females: 35-104 u/l
(higher in children and adolescents)

Comments:

New assay as of (9/5/02).  See reference range change.

Test
Limitations:

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

Icterus: No significant interference up to an I Index of 70 (conjugated 
bilirubin) and an I Index of 70 (unconjugated bilirubin) corresponding 
to approximately 70 mg/dl conjugated and 70 mg/dl unconjugated 
bilirubin.

Hemolysis: No significant interference up to an H index of 500 
(approximate hemoglobin concentration: 500 mg/dl).

Lipemia (Intralipid): No significant interference up to an L index of 
2000. 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:

Spectrophotometric

CPT Code:

84075