What is TSH (Thyroid Stimulating Hormone)?
The thyroid stimulating hormone (TSH) level in blood is a gauge doctors use to determine thyroid health. If a patient is gaining or losing weight unexpectedly or suffering fertility problems, TSH levels may be abnormal and could be a sign of hyperthyroidism or hypothyroidism. TSH levels can be measured as part of a series of blood tests that may or may not include free thyroxine and total thyroxine tests. If TSH levels are abnormal, doctors will order thyroxine blood tests so in many cases all three tests are ordered at the same time.
Normal Value Range
- Negative Pregnancy Adult: 0.34 to 4.25 µlU/mL or NO NUMBERS or 0.34 to 4.25 mU/L
- Pregnancy Trimester One: 0.6 to 3.4 µlU/mL or 0.6 to 3.4 mU/L
- Pregnancy Trimester Two: 0.37 to 3.6 µlU/mL or 0.37 to 3.6 mU/L
- Pregnancy Trimester Three: 0.38 to 4.04 µlU/mL or 0.38 to 4.04 mU/L