APTT ratio - therapeutic heparin ratio

 

Alternative names, keywords

 

Samples required

Trisodium citrate blood (blue cap, 3.5 mL tube) taken with minimal stasis, filled to the line. Smaller tubes are available for paediatric samples.

Samples must be analysed or processed in the laboratory within 4 hours of venepuncture.

Test indications

 

Reference range

2.0 – 2.5

Source: locally determined.

Turnaround time

1 working day

Enquiries

Haematology (Coagulation)