Coagulation Screen

Test information: The Coagulation screen comprises of both a PT (Prothrombin Time) and an APTT (Activated partial Thromboplastin Time ). They measure the activity of the Intrinsic, Extrinsic and common factors of the Coagulation pathway. The APPT measures the clotting time of the intrinsic and common pathway. The term 'thromboplastin' in this test refers to the formation of a complex formed from various plasma clotting factors which converts prothrombin to thrombin and the subsequent formation of the fibrin clot.It can be used in conjunction with the PT or for monitoring Unfractionated Heparin. The Prothrombin Time (PT) is used in combination with the APTT as general screening procedure for clotting abnormalities and for monitoring patients receiving warfarin anticoagulant therapy. The sample must reach the lab within 2 hours.
PLEASE ALSO REFER TO Prothrombin Time (PT) and Activated Partial Thromboplastin Time (APTT) pages

Specimen Type(s)

• Blood;

Other Acceptable Specimen Type(s)

Blue top for paediatric samples

Specimen Container - Adult

• Light Blue Top BD;

Specimen Container - Paediatric

• N/A;

Analytes

• N/A;

Part of a test profile?

No

Volume (min) of sample to be sent to laboratory

4ml

Patient Preparation, Sample Handling and Transport

Please make a note of any anticoagulants and/or bleeding/bruising symptoms.

Maximum add on time

4 hours

Units and Reference Ranges / Interpretation

N/A

UKAS number

8869

UKAS accredited test?

Yes

Comments

Testing is available outside normal laboratory hours.

If you have any queries about a test or results interpretation please contact us.