Patient Information

Anticoagulation clinic


This offers information for anyone who attends the anticoagulation clinic.

What is anticoagulation medicine ?

Anticoagulant medicine is used to prevent a clot forming in your blood or to treat clots that have already formed.

There are various types of anticoagulation medicine:

  • warfarin
  • DOACs (direct oral anticoagulants) including Apixaban, Rivaroxaban, Dabigatran and Edoxaban
  • Fragmin injections.

What is the anticoagulation clinic?

The clinic supports adult patients who need anticoagulation treatment. Your doctor may have prescribed anticoagulation medicine for you, or they may have asked the clinic to start prescribing it for you.

The clinic advises patients on interruption of their anticoagulation medicine (bridging) prior to planned medical procedures.

It also supports and prescribes medicine for patients who have been advised they need anticoagulation medicine for long haul flights.

The clinic is run by clinical nurse specialists (CNS). The CNS team works alongside a consultant haematologist (a doctor with expertise in blood disorders).

What happens when I first attend the clinic?

When you first attend the clinic you can expect the following.

Blood tests

Usually we ask patients to have a blood test before their first appointment.  We will let you know when and where to have your blood test.

Your blood test results enable us to decide which form of anticoagulation medicine is best for you. 

Anticoagulation medicine

We base our decision about which anticoagulation medicine to prescribe for you on various factors.  These include the condition you have been diagnosed with, your blood test results or other underlying health issues.

A CNS will talk to you about your anticoagulation medicine and what you can expect while you are taking it. They will also give you an information booklet on the medicine you will be taking.

Ask your CNS if you have questions about your anticoagulation medicine.

Finger prick testing

We offer finger prick testing for patients who are already on warfarin or who are likely to be prescribed with warfarin.

A finger prick tests means we prick your finger and test the blood from there, instead of taking blood from your arm. After a finger prick test we can give you the result straightaway.

A finger prick blood test only measures the amount of warfarin in your blood so it is not suitable for patients on Fragmin or DOAC medicine.

Where will my clinic appointment take place?

Most first appointments are telephone consultations with a CNS. Sometimes the CNS may ask to see you in person.

We offer appointments on a Monday or Tuesday pm or a Wednesday or Friday am.

The clinic is in the Blood Test Department, Room 6.  This is located in the Kingston Hospital Main Outpatients department.

We run bridging clinics everyday.  These appointments are telephone only.

What happens after my first appointment?

Patients on warfarin

We may see you several times at the start of your warfarin treatment.

If you are taking warfarin we will ask you to attend a follow up appointment on Monday morning or Thursday afternoon.

When your warfarin level is stable, we will transfer you to the ‘postal’ follow up appointment system. This system requires you to have a blood sample taken from your arm.  The postal system gives you the freedom to have your blood taken at your GP practice or at Kingston Hospital on a specified day (but without the restrictions of a fixed appointment time).

Depending on the results of your blood test, the anticoagulation service will either ring you or post your results to you.  They will give you information on what dose of warfarin to take and when you need to take your next blood test. 

Patients on Fragmin

If you are on Fragmin injections only, you may not have to attend a follow up appointment.

Ring the anticoagulation clinic to ask for a new prescription 10 days before your injections run out.

Patients on DOACs

If you are on DOAC medicine we will give you a follow up appointment and will then transfer you to the care of your GP.

The CNS will be able to give you more information on any follow up appointments you may require.

How can I keep a record of my blood tests?

The Anticoagulation Service will post you a copy of your blood test result and/or instructions on how much medicine you need to take.

This information will be in a ‘payslip’ format which contains your personal details, your results and dosing, and the request form for a further blood test.  

When you attend the anticoagulation clinic, always bring this ‘payslip’ paper record.  It will tell us if your GP or district nurse has been taking your blood.

If you take warfarin, contact the anticoagulation clinic if you do not receive this ‘payslip’ within 3 days of having a warfarin blood test.

Important information graphic

Keep a record of your blood tests and the amount of warfarin or Fragmin you are taking.

Always have a warfarin blood test when we ask you to do so.


Kingston Hospital anticoagulation clinic for questions about medicines or treatment, Monday to Friday 9am to 5pm 020 8934 2321 Option 5 ask for the nurse on duty
Kingston Hospital anticoagulation clinic for appointment or admin questions, Monday to Friday 9am to 5pm  020 8934 2321 Option 5

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