The Activated Partial Thromboplastin Time (APTT) measures the activity of the intrinsic and common pathways of the coagulation cascade. The APTT is used as a part screen for the assessment of normal coagulation. It is also used in the monitoring of unfractionacted heparin therapy with the results usually expressed as an APTT ratio
|05 (CP) - Citrate
|This test can only be added to samples within 4 hours of collection.
Day Case: 6 Hours
In-Patient: 6 Hours
Out-Patient: 24 Hours
GP: 24 Hours
|Blood Sciences Cross Site
|For further details please contact Leeds Pathology customer services: firstname.lastname@example.org.
|Citrate tube must be filled to the fill line.
Instructions for Lab Staff: Standard lab processing- No special requirements.
|Ref. Range Notes
|Blood Sciences Refernce ranges available through the useful information and links page:
|Data entry set(s)As APTT for heparinLGI: APTT1LSJUH: APTT1JAs coagulation screenLGI: CSC2LSJUH: CSC2JAs INR/APTT for warfarin and heparinLGI: HW1LSJUH: HW1J
|As APTT for heparin: APTT1LAs INR/APTT for warfarin and heparin: HW1LAs coagulation screen: LCS