Biotin supplements may cause clinically significant interference for this test assay. If interference is suspected, it is strongly recomended that biotin is discontinued for at least one week prior to retesting
Spin
Lt green plasma separator (PST)
Gold serum separator (SST) tube
Refrigerated (preferred) - 8 days
Ambient - 8 days
Frozen - 24 months
Electrochemiluminescence immunoassay (ECLIA)
< 34 IU/mL