TSH (Thyroid Stimulating Hormone)
- Main Screening Test
- High = Hypothyroidism
- Low = Hyperthyroidism
- Normal values drop in Pregnancy (see “Hypothyroidism”)
- Main follow-up test for abnl TSH
- High = Hyperthyroidism
- Low = Hypothyroidism
- Less reliable in general
- High = Hyperthyroidism
- Low = Hypothyroidism
- Only ordered in context of Hyperthyroidism
- Calculation derived from Total T4 + T3 Resin Uptake
- Useless today, because FT4 readily available
- Better than Total T4 if FT4 too expensive
- Nothing to do with T3
- An ingredient in FTI calculation [see above]