APTT (activated partial thromboplastin time)**

Sample type	Blood
Container	Sodium citrate	Click image to enlarge ×
Sample volume	1.4 mL
Turnaround time	2 hrs
Hospital	CHI at Temple Street
Telephone number
Laboratory	Haematology
Special precautions / Clinical Comment	Samples must be filled to the line marked on the side of the tube. Overfilled or underfilled samples will give inaccurate results and will not be analysed. Test must be performed within 2-4 hours of the sample being taken. If patient is on heparin therapy, samples must be centrifuged within 1 hour of the sample being taken and the plasma must be tested within 2 hours of sample being taken Interferences: clots in the sample, heparin. ** Test not accredited; this does not invalidate the results
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