Samples should be centrifuged and serum removed within two hours of collection.
Repeated freeze/thaw cycles should be avoided. Specimens that are very lipemic (3+) or that are turbid from freezing need to be clarified by centrifuging for 10 minutes at approximately 15,000 x g prior to testing.
In very rare cases gammopathy, especially monoclonal IgM (Waldenström’s macroglobulinemia), may cause unreliable results. Samples containing heterophilic antibodies can cause falsely elevated results. Please note that oral contraceptives have been reported to affect results.
Monday through Friday at 0900
Samples received in the laboratory section after 0900 will be run on the next business day.