Activated Partial Thromboplastin Time & Prothrombin Time (APTT & PT)

Citrated Whole Blood

Adult: 2 mL

Paediatric and Neonate: 1 ml

 

- Gently invert the tubes several times to prevent clotting. Clotted specimen is not suitable for testing.

 

- To collect blood to the designate marking. Over or under filling will compromise the test results.

 

- When using a winged blood collection set for venipuncture and a coagulation tube is the first tube drawn, draw a discard tube first.

 

- When obtaining specimens from indwelling lines that may contain heparin, the line should be flushed with 5mL of saline; and the first 5mL of blood or 6-times the line volume (dead space volume of the catheter) be drawn off and discarded before the coagulation tube is filled.

 

- For those samples collected from a normal saline lock (capped off venous port) twice the dead space volume of the catheter and extension set should be discarded.

 

-For patient with high haematocrit level of ≥ 55.0%, a laboratory-prepared container with an adjusted volume of sodium citrate is required. Please contact Haematology Laboratory (Ext. 1373).