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To evaluate thyroid hormone levels related to deficiency or excess to assist in diagnosing disorders such as hyperthyroidism and hypothyroidism.
There are no food, fluid, activity, or medication restrictions unless by medical direction.
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|
Critical Findings and Potential Interventions