The activated partial thromboplastin time (aPTT) test is a screening procedure used primarily to determine deficiencies in factors necessary for the formation of intrinsic prothrombin activator, namely factors VIII, IX, XI and XII.
Factors II, V and X deficiencies (normally detected by the prothrombin time) can also be detected by the aPTT.
The test will not detect platelet disorders, isolated factor XII and factor XIII deficiencies.
Lt blue Sodium citrate (NaCit) - 2.7mL
Refrigerated - NO
Coagulation test method
0-2 months: 29 - 50 seconds
3-6 months: 28 - 43 seconds
Adult: 25 - 36 seconds
Heparin therapeutic range: 76 - 99 seconds
0 - 28 days of age or outpatient: > 60 seconds