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.
Yes, although it's not a good idea to take megadoses of vitamin C when you're pregnant. There's some limited evidence that taking too much vitamin C in the form of supplements during pregnancy may increase the risk of preterm birth. Excessive vitamin C can also upset your stomach. The recommended daily amount of vitamin C during pregnancy is 85 milligrams (mg) per day for women age 19 and older, and 80 mg for women ages 14 to 18. The maximum daily amount that's considered safe for women in these same age groups is 2,000 mg and 1,800 mg respectively.