Specimen

Plasma

Collection Medium:

Alternate
Collection Media:

Call laboratory for additional acceptable specimen collection 
containers.

Minimum:

2 ml whole blood from light green top tube

Testing Schedule:

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

Analytic Time:

2 hours (upon receipt in laboratory)

Reference Range:

700-1600 mg/dl

Test
Limitations:

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

Icterus: No significant interference up to an I index of 60 
(approximate conjugated and unconjugated bilirubin concentration: 60 
mg/dl).

Hemolysis: No significant interference up to an H index of 1000. 
(approximate hemoglobin concentration: 1000 mg/dl)

Lipemia (Intralipid): No significant interference up to an L index of 
3000.

There is poor correlation between turbidity and triglycerides 
concentration.

There is no cross-reaction between IgG, IgA and IgM under the assay 
conditions.

Sera with ill-defined clinical characteristics should first be 
subjected to protein electrophoresis so that an antigen excess (e.g. 
gammopathy), if present, can be identified.

IgG concentrations of more than 44,000 mg/dl (440 g/l) can cause a 
high-dose hook effect.

Methodology:

Immunoturbidimetric

CPT Code:

82784

See also:
Cryoglobulin, Serum