Collect	Light Blue (3.2 % Sodium Citrate)
	Transport	Room Temperature
	Minimum Volume	1 Full, unopened light blue top tube
	Remarks	The maximum time limit for accepting PTT samples from non-heparinized patients will be 12 hours. If samples can not be tested in 12 hours, the blood samples should be “double centrifuged”. After initial centrifugation of blood samples, transfer plasma to a plastic pour-off tube, and centrifuging again the pour-off tube. The resulting platelet poor plasma is transferred to a new plastic tube and kept frozen at - 20°C. Because of the instability of PTT in the presence of heparin, the maximum time for accepting samples from patients treated with heparin remains 4 hours.

85730 *The CPT codes provided are based on the AMA guidelines and for informational purposes

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