Šaldova 24
Praha 8 Karlín
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INR measurement

Patients on anticoagulants such as Warfarin (to reduce the risk of blood clotting) need to have their INR value regularly checked. Among the most common reasons for this treatment are cardiac problems (patients with a pacemaker, irregular heart rate, or after valve replacement…), thromboembolic disease, and as a follow-up to major operations (such as the replacement of joints).

During this treatment it is important to adjust the dose of medication, so that blood is neither too diluted (with a risk of bleeding), nor too thick (with a risk of clotting). Measurement of the INR parameter helps with this adjustment.

In the beginning of treatment INR must be checked more frequently. After stabilisation of the INR level (normally at a value of between 2 and 3), the frequency of testing can be reduced to once every 4-6 weeks.

The blood test is carried out in our surgery on the spot. The whole examination takes no more than about five minutes. Just one drop of blood is needed, which is taken with a prick from the patient’s fingertip. The nurse then puts the drop onto special paper, which is inserted into a diagnostic instrument and in a few minutes we have the results.

The patient does not need to refrain from eating before the examination, which can be carried out at any time during the day. If the INR value is between 2 and 3, the nurse will book the patient for the next check-up. If not, the doctor must check the result and consult further with the patient (adjusting the Warfarin dose).