Printer friendly page

Primary Name Partial Thromboplastin Time
Synonym Activated partial thromboplastin time
Synonym Activated PTT
Contraction PTT
Contraction APTT
Contraction --
UAB Procedure Number 2500140
CPT Code 85730
Specimen Collect one (1) blue-stopper tube (3.2% sodium citrate), filled to specified volume. Specimen will be rejected if underfilled.

Specimen Management Centrifuge blue-stopper tube within one ( 1) hour of collection, separate plasma and test or quick-freeze at -70°C.
Specimen Accepted Daily including weekends
Times Available All times
Test Performed All times
Available Stat? Yes
Description APTT is performed to monitor unfractionated heparin therapy, detect coagulation inhibitors, and to detect factor deficiencies of the intrinsic and common pathways. Prolonged APTTs in the absence of heparin require APTT mixing studies. The APTT is not valid for monitoring low molecular weight heparin--use the anti-Xa heparin assay.
Reference Interval Call lab for current reference range
Critical Value Call lab for current critical value
Therapeutic Range Call lab for current therapeutic range
Follow-up Test PTT mixing studies
Associated With Coagulation factor inhibitors
Associated With Bleeding disorders
Associated With Venous thrombosis
Associated With Heparin therapy
Associated With Lupus anticoagulant
Associated With Disseminated intravascular coagulation

© Copyright by the University of Alabama at Birmingham