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Alternative names, keywords |
APTT ratio, activated partial thromboplastin time ratio, INR, international normalized ratio, clotting screen, fibrinogen (Clauss). |
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Samples required |
Samples must be analysed or processed in the laboratory within 4 hours of venepuncture. |
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Test indications |
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Reference range |
Source: locally determined. |
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Turnaround time |
1 working day (2 hours if identified as urgent). |
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Enquiries |
Haematology (Coagulation) |
Trisodium citrate blood (blue cap, 3.5 mL tube) taken with minimal stasis, filled to the line. Smaller tubes are available for paediatric samples.