Tsh normal value for 1 week old
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neonatal AND "thyroid stimulating hormone"
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newborn screening TSH normal values age 1 week official guideline
For a term 1-week-old newborn, serum TSH is usually below 10 mIU/L (µIU/mL). It falls rapidly after the normal birth surge and is generally close to the usual childhood range by about 2 weeks. A newborn screening review notes TSH is usually <10 mU/L at 1 week.
Interpret it using the laboratory's age-specific reference range, because results differ by assay, gestational age, and whether the value is from a heel-prick screening sample or venous serum.
- TSH >20 mIU/L in the first 2 weeks generally needs prompt confirmatory serum TSH plus free T4 and pediatric review.
- A mildly raised result, such as 10-20 mIU/L, may require repeat testing depending on free T4 and the baby's clinical situation. Congenital hypothyroidism guidance supports confirmatory testing for elevated newborn results.
If you share the exact TSH value, units, free T4, and whether the baby was premature, I can help interpret it more specifically.
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