terpreted as postovulatory luteal phase rather than follicular. Assuming a 2.2 mg/L positive bias with SST, our current laboratory follicular phase progesterone reference range of ,1.6 mg/L could increase to ,3.8 mg/L with SST. We recommend that all progesterone serum samples be collected in plain glass tubes until this SST interference problem is resolved. Our laboratory has notified Roche Dia...
