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.
Too much vitamin A may be harmful to a developing baby in the first three months of pregnancy. As a result, the Department of Health advises all pregnant women and women planning a pregnancy to avoid foods or supplements which contain high levels of vitamin A such as liver, liver sausage, liver pate pÃ¢tÃ© and cod liver. oilaw shell fish. Raw shell fish sometimes contains harmful bacteria or viruses that can cause food poisoning. Unpasteurised milk. All unpasteurised milk including cows', goats' and sheep's milk should be avoided.