Test Name
ACTIVATED PARTIAL THROMBOPLASTIN TIME (APTT)
Aliases
PARTIAL THROMBOPLASTIN TIME, KAOLIN CEPHALIN CLOTTING TIME
Abbreviations
APTT, PTT, KCCT
Test Classification
GROUPED TEST
Department
HEMATOLOGY
Sub Department
COAGULATION
TAT Category
BUSINESS (WORKING) TIME
Estimated TAT
2
TAT Units
HOURS
Test Requirements
Collect whole blood in CITRATE TUBE (LIGHT BLUE CAP) FILLED UP TO THE MARK & submit to the lab immediately at ROOM temperature. If >4 hour delay is expected between collection & analysis, centrifuge, separate plasma & freeze. Submit frozen plasma. Provide history e.g. whether patient is on anticoagulants (e.g. heparin) and whether they have a bleeding tendency.
SHIPPING/ TRANSPORTATION REQUIREMENTS
Shipping Temperature: Refrigerated
ANALYTE STABILITY
Room Temperature: 2-8 hours at 20-25°C │ Refrigerated: 2-8 hours at 2-8°C │ Frozen: 2 WEEKS at -20°C
Clinical Utility
Monitor patients on unfractionated heparin (UFH) therapy. examine factor deficiency in the intrinsic & common coagulation cascade pathway. Evaluate patients with bleeding disorders and liver disease.
Last Review
26th Feb 2026