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A complementary laboratory test in evaluating thyroid hormone levels, a screening test for newborns to detect thyroid dysfunction, and a tool to evaluate the effectiveness of therapeutic thyroid therapy.
Serum collected in a gold-, red-, or red/gray-top tube. Plasma collected in a green-top (heparin) tube is also acceptable.
|Age||Conventional Units||SI Units (Conventional Units × 12.9)|
|Cord blood||6.6–17.5 mcg/dL||85–226 nmol/L|
|1–30 d||5.4–22.6 mcg/dL||70–292 nmol/L|
|1 mo–23 mo||5.4–16.6 mcg/dL||70–214 nmol/L|
|2–6 yr||5.3–15 mcg/dL||68–194 nmol/L|
|7–11 yr||5.7–14.1 mcg/dL||74–182 nmol/L|
|12–19 yr||4.7–14.6 mcg/dL||61–188 nmol/L|
|Adult||4.6–12 mcg/dL||59–155 nmol/L|
|Pregnant female||5.5–16 mcg/dL||71–206 nmol/L|
|Over 60 yr||5–10.7 mcg/dL||64–138 nmol/L|