Monitor immune complex disease (ie, lupus, glomerulonephritis, serum hepatitis, arthritis, vasculitis); monitor progress of some malignancies.
Spin, separate, transfer specimen to plastic transport tube, and freeze.
Frozen plastic transport tube labelled as serum.
Samples may be stored at 2-8 ºC for seven days prior to testing.
Hemolysis; heating samples for thawing may give false positive results, avoid repeated thawing and freezing.
Enzyme immunoassay (EIA)
Negative: < 4.4 μg Eq/mL
Equivocal: 4.4 - 10.7 μg Eq/mL
Positive: > 10.7 μg Eq/mL