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To evaluate thyroid hormone levels related to deficiency or excess to assist in diagnosing disorders such as hyperthyroidism and hypothyroidism.
Serum collected in a gold-, red-, or red/gray-top tube.
(Method: Immunochemiluminometric assay [ICMA])
|Age||Conventional Units||SI Units (Conventional Units × 10)|
|0–1 wk||3–8 mg/dL||30–80 mg/L|
|1–12 mo||1.6–3.6 mg/dL||16–36 mg/L|
|14–19 yr||1.2–2.5 mg/dL||12–25 mg/L|
|Greater than 20 yr||1.3–3.3 mg/dL||13–33 mg/L|
|Pregnancy, third trimester||4.7–5.9 mg/dL||47–59 mg/L|
|Oral contraceptives||1.5–5.5 mg/dL||15–55 mg/L|