Roche COBAS colorimetric by reaction with nitroblue tetrazolium
Rejection Criteria
Moderate or greater hemolysis
Reference Range(s)
<=285 UMOL/L
Specimen Requirements
Preferred Specimen
Serum separator tube
Minimum Volume
0.3 mL
Sample Stability
3 days room temperature 2 weeks refrigerated 2 months frozen
Transport Temperature
Refrigerated
Collection Instructions
1 mL serum. Allow SST to clot in an upright position for
at least 30 minutes, then centrifuge sample within 2 hours
of collection. Refrigerate
Alternative Specimen
Clot in an upright position for at least 60 minutes, then
centrifuge sample and transfer serum to a plastic transport
tube within 2 hours of collection. Clearly label tube as
serum from a plain red top tube. Refrigerate.
