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THYROXINE (T4) FREE, SERUM

Synonym(s):

Free T4, FT4

Lab Section Category

Description

Indications

Specimen Required

​3 mL plain blood

Storage and Transport

Method

​Immunoassay

Test Results

Reference Interval / Value

​Cord blood : 9.9 - 19.4 pmol/L

5 days - 1 mth : 11.4 - 29.4 pmol/L

2 mth - 5 yrs : 8.5 - 20.4 pmol/L

6 - 12 yrs : 8.9 - 16.2 pmol/L

≥ 13 yrs : 8.8 - 14.4 pmol/L

Turnaround Time

​Mean = 4 hrs, Range: 3 – 5 hrs

Day(s) Test Set up

​Daily

Remarks

Change History Notes

Others

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