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.
Pregnant women wasting money on vitamin supplements, study says. Research claims multivitamins and minerals do not improve mothersâ or babiesâ health and are an unnecessary expense. A customer shopping for multivitamins. An unknown number of women take supplements during their pregnancy. Photograph: Steve Debenport/Getty Images Most pregnant women who take multivitamin and mineral supplements are wasting their time and money because such tablets do not improve their or their babyâs health, new research says.