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How much does it cost?

Please note – In addition to the price of tests, there is also a phlebotomy cost for the withdrawal and handling of your sample. This is a standard charge across all clinics. The cost of sample handling is £50, but this is discounted to £30 only if paid in advance. Please choose the pay later option to pay the full amount upon your arrival at the clinic or choose pay now in order to pay in advance and secure the discounted fee.

As part of an investigation of a bleeding or thrombotic episode. To help evaluate your risk of excessive bleeding prior to a surgical procedure.
  • APTT only.
APTT ratio
The APTT Ratio is used to monitor the use of unfractionated heparin.
  • APTT ratio only.

How does it work?


Find your test(s)

Browse our tests and profiles. If the test you are looking for is not on our website, contact us for more information. We have 1000+ tests.


Book an appointment

Click “book now” & select the date and time. If you do not know which test you need, or if you need multiple tests, select “general appointment”. Pay for your appointment in advance & save £20 on phlebotomy fees.


Visit our clinic

Upon arrival at the clinic, our staff will confirm your test selection, and take the samples required to provide you your reports.


Receive your results

After analysing your sample in our lab, you will receive a PDF report by email. Most results are available within 24 hours.

What can I learn from this test?

The activated partial thromboplastin time (aPTT or PTT) measures the length of time (in seconds) that it takes for clotting to occur when specific reagents are added to plasma (liquid portion of the blood) in a test tube. It is a measure of the functionality of the intrinsic and common pathways of the coagulation cascade.

What can I test?

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How do i find you?

Patient reception

Our patient reception is located at 42 Foley Street, Fitzrovia, W1W 7TS

Walking distance from Oxford Circus & a number of other underground stations.

Opening hours

Our opening hours are:

Monday to Friday

9.30AM - 7PM


Appointment only

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