Medical Diagnosis is a private clinical pathology laboratory based in North London, close to Wembley Stadium, that provides a wide range of direct laboratory-to-client services to both healthcare professionals and the public.

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Medical Diagnosis Exams

Activated Partial Thromboplastin Time (aPTT)


The activated partial thromboplastin time measures the activity of the intrinsic and common pathways of coagulation.

APTT is used for monitoring heparin therapy (unfractionated heparin), screening for certain coagulation factor deficiencies, and detection of coagulation inhibitors such as lupus anticoagulant, specific factor inhibitors, and nonspecific inhibitors.

Samples required: 1
  • Blood Sample
Turnaround time: 4 hours

There is an additional £12 phlebotomy fee for every donation.