Kenya Medical Laboratory Tests

Plasma prothrombin ratio Test in Kenya

Brief Description

This test is used to screen for"," and diagnose bleeding and clotting disorders. The international normalized ratio (INR) is calculated from the prothrombin time and used to monitor anticoagulation therapy.


Prothrombin time (PT)

Patient Preparation

There are no special preparations for this test. The patient"," however"," should inform the physician about medications they are taking.

Sample Type

Whole blood/plasma

Sample volume


Sample collection Container

Sodium citrate tube (blue top)

Sample collection instructions

Sample should be gently mixed after collection for adequate mixing of the anticoagulant with blood. The sample collection tube should not be opened unless plasma will be frozen for storage.

Sample storage

In case of intended delays in testing"," the sample should be centrifuged for 10min and plasma separ

Reference range

Usually reported as INR. INR: 2 3.5

Results Turnaround

Within 24hrs of sample collection.

Diseases / Diagnostic Indicators

Abnormal PT/INR results usually indicate a clotting disorder"," a bleeding disorder"," vitamin K deficiency or a liver disease. Results are also affected by anticoagulation therapies.