Cryoglobulin (% Cryocrit), Serum

Allow serum sample to clot for one (1) hour in a 37° C water bath, oven, incubator, or heat block. After clotting, centrifuge the specimen for 10 minutes at 1600 RCF (G) utilizing one of the 3 options below:
1. In a "warm" centrifuge at 37° C
2. In a bench-top centrifuge placed in a "warm room" at 37° C
3. At room temperature, in a bench-top centrifuge prewarmed by running it for 10 minutes at 1600 RCF (G)
After centrifuging, decant serum into a screw-cap vial and transport at room temperature.

Note: If the sample is not kept at 37° C during all processing steps, the cryoprecipitate, if present, can precipitate out of solution and be lost in the clot or during the centrifugation process and result in a false negative result.

DO NOT REFRIGERATE OR FREEZE.

No other tests can be added to the tube; Cryocrit and Cryoglobulin evaluation only.