Synonym(s):
Free T4, FT4
3 mL plain blood
Immunoassay
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
Mean = 4 hrs, Range: 3 – 5 hrs
Daily
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