Thrush is a type of fungal infection. It occurs in your mouth and throat. Thrush does not usually affect healthy adults. It is more common in people with impaired immune systems. It is also more likely in those who take certain kinds of medicines.
This test measures the level of the hormone thyroxine (T4) in your blood. This test can show whether your thyroid gland is overactive (hyperthyroidism) or underactive (hypothyroidism).