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Activated Partial Thromboplastin Time with 50% correction (APTT 50%)

Test Code:



Specimen Container

Sodium Citrate Tube

Specimen Requirement

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.

Specimen Storage / Transport

Send to laboratory as soon as possible after blood collection. Do not send in ice.



Orderable as STAT?


Turn Around Time

Routine: 3 - 4 hrs

Reference Value(s)


Testing Laboratory Location




Contact Number

6394 1373

Day and Time Performed

Daily, 24 hrs

Orderable on CPOE?


Additional Information

This test includes APTT and APTT 50%.

Change History Notes



Activated Partial Thromboplastin Time with 50% correction (APTT 50%) CG0123

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