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APTT
(a.k.a Activated partial thromboplastin time)
minimum sample volume required ~ 2.7ml
Tube type: 9NC
Special instructions
Citrate sample must be received in lab within 4hours. Please note that the etched fill indicator on the plastic citrate tubes indicates the minimum acceptable blood volume required for analysis. Time limit for add on = <4 hours. Haemolysed samples should not be tested.
Reference range
Normal Range: 25.1-36.5
Units
Seconds
Linked to
Clotting screen
Turnaround Time
6
hours
Department: Haematology
Clinical Application
Please note: for unfractionated heparin monitoring, the sample should be centrifuged 1-2 hours after collection and tested within 4 hours to avoid the substantial loss of heparin over time in citrated whole blood.
Links:
» Paediatric normal ranges
