Prior to drawing sample, patient must be fasting for
eight (8) hours and must not have taken aspirin or
medications containing aspirin within the previous 7-10
days (Contact lab for medication list). Physician must
provide a list of medications that have been taken.
Routine venipuncture; discard 1st mL of blood or collect
other tubes ( red-topped) prior to collecting sample in
4 blue-topped (3.2% sodium-citrate) tubes
and one (1) purple topped tube. Immediately invert tubes
gently at least 4 times to mix. Needle size should be
between 19 and 21 gauge
Specimen must be delivered to the lab within one (1)
hour of collection, and is stable for 3-4 hours at room
temperature. The specimen should always be handled at
room temperature (20-25°C) before testing and should
never be refrigerated or chilled on ice or frozen.
Stable at room temperature for 3-4 hours.
Causes for Rejection:
QNS, clotted, improperly collected samples, sample
identification error, thrombocytopenia with platelets
count < 100 x 103/µl, severe hemolysis or
lipemia, samples received in lab > 1 hours since