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Thyroid Range (TSH/T3/T4)

TSH (Thyroid Stimulating Hormone) is the primary screening test. T3 and T4 are confirmatory. Pregnancy demands tighter TSH (< 2.5 in 1st trimester).

TSH (mIU/L)2.50

T3 (ng/dL)120

T4 (µg/dL)8.0

Pregnant

TSH

Normal

FAQ

Subclinical hypothyroidism — should I treat?

TSH 4.5-10 with normal T3/T4 is "subclinical". Treatment debated — pregnancy planning and cardiovascular risk push for treatment; otherwise wait-and-watch with retest in 3-6 months.

My TSH is 0.5 but I feel hyper — concerning?

Anti-TPO and TSI antibodies might point to Graves' or thyroiditis. Get them tested if symptoms (palpitations, weight loss, anxiety) persist despite normal TSH.

Why is pregnancy TSH limit lower?

Higher demand on thyroid in pregnancy. Untreated hypothyroidism increases miscarriage and developmental delay risk. ATA recommends TSH < 2.5 first trimester, < 3 thereafter.