EDTA blood is NOT suitable.
Useful in differentiating primary from secondary polycythaemia.
If the sample is not collected at Northern Hospital Epping [i.e. collected at other collection sites (Broadmeadows Hospital, Bundoora Centre and Craigieburn Centre)], the primary SST tube shall be centrifuged, serum aliquoted and the serum kept cool with ice blocks at all times. When the serum specimen arrives at the laboratory, the specimen shall be frozen at -20 degees Celsius.