Prothrombin Time (PT) International Normalise Ratio (INR)

Test Code:

CG0110

Synonym(s):

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.

Method

Orderable as STAT?

Yes

Turn Around Time

Stat: 1 hr
Routine: 2 - 3 hrs

Reference Value(s)

Age Group	Gender	Reference Intervals (secs)
0 mins - 2 days	both	14.4 - 16.4
3 days - 30 days	both	13.5 - 16.4
31 days - 11 month	both	11.5 - 15.3
1 years - 5 years	both	12.1 - 14.5
6 years - 10 years	both	11.7 - 15.1
11 years - 16 years	both	12.7 - 16.1
17 years and above	both	11.6 - 14.2

Recommended INR range for oral anticoagulation (warfarin): 2.0 - 3.5

Testing Laboratory Location

KKH

Laboratory

Haematology

Contact Number

6394 1373

Day and Time Performed

Daily, 24 hrs

Orderable on CPOE?

Yes

Downtime Form

63170-Form-1080 Haematology Laboratory Downtime Form

Additional Information

Change History Notes

Others

Keywords

"Prothrombin Time (PT) International Normalise Ratio (INR)" PT/INR CG0110

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