Thyroid function tests are blood tests that check the levels of the hormones (chemicals) made by the thyroid gland. Some thyroid function tests also check the level of a hormone made by the pituitary gland in the brain, which acts on the thyroid gland.hyroid function tests are blood tests that check the levels of the hormones (chemicals) made by the thyroid gland. Some thyroid function tests also check the level of a hormone made by the pituitary gland in the brain, which acts on the thyroid gland.
Yes, high intakes of some forms of vitamin A can be harmful. Getting too much preformed vitamin A (usually from supplements or certain medicines) can cause dizziness, nausea, headaches, coma, and even death. High intakes of preformed vitamin A in pregnant women can also cause birth defects in their babies.
Prenatal vitamins are safe and important to take when you're pregnant. Ask your health care provider about the safety of taking other vitamins, herbal remedies, and supplements. Most herbal preparations and supplements have not been proven to be safe during pregnancy. Generally, you should not take any OTC medication while pregnant unless it is necessary. The following medications and home remedies have no known harmful effects during pregnancy when taken according to the package directions.