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Free T4

Test Code:

XU0041

Synonym(s):

Specimen Container

Gel separator tube (Adult)
Microtube (Paeds)

Specimen Requirement

Plain Blood
Adult: 5 mL
Paediatric: 1.3 mL

Invert blood 5 times after blood collection ensures the clot activator is well mixed with the blood. This will ensure results are reliable.

Specimen Storage / Transport

Method

 

Orderable as STAT?

Yes

Turn Around Time

3 - 4 hrs

Reference Value(s)

- Cord: 12.5-27.5 pmol/L
- <3rd day: 25.7 -64.3 pmol/L
- 3rd-30th day: 11.6 to 28.3 pmol/L
- 31st day-18th year: 10.3-25.7 pmol/L

- Adult: 9.0 - 19.1 pmol/L

Free T4 reference intervals for women with singleton pregnancies 15-50 years old (inclusive)
09 to 14 wks gestation: 11.4 - 19.5 pmol/L
18 to 22 wks gestation: 10.1 - 15.4 pmol/L
28 to 32 wks gestation: 9.5 - 14.9 pmol/L
34 to 39 wks gestation: 8.9 - 14.7 pmol/L

Testing Laboratory Location

KKH

Laboratory

Clinical Chemistry

Contact Number

6394 1383

Day and Time Performed

Mon - Fri: 0800 hrs to 1700 hrs
Sat: 0800 hrs - 1230 hrs

Orderable on CPOE?

Yes

Downtime Form

Additional Information

Critical Value:
below 2 months old only < 5.2 pmol/L

Change History Notes

Others

Keywords

Free T4 XU0041 FT4
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