an imaging technique in which a radioactive substance is introduced into the body and its emitted radiation is detected; specific organs can be studied according to the amount of the radioactive substance that they absorb
Triiodothyronine (T3) is the active thyroid hormone which governs metabolism in our cells. It is produced from T4 by the removal of an atom of iodine. At times, the wrong atom is removed resulting in Reverse T3. Reverse T3 can block the action of T3 in our cells. Small amounts of rT3 are normal and actually regulate T3 uptake in our cells, but in times of stress more rT3 is produced which limits the action of T3. This can cause symptoms associated with an underactive thyroid even though blood test levels of T4 and T3 may be normal.
a rare disorder mainly affecting those under the age of 15 that is characterised by brain and liver damage following a viral infection such as chickenpox or the flu; may be linked to taking aspirin to treat a viral infection
a blood group classifying whether the substances called Rhesus (Rh) factors are present on the surface of red blood cells; the "positive" or "negative" designation in blood classification (for example, "O negative")
a condition in which a woman who has a negative Rh factor develops permanent antibodies against Rh-positive blood as a result of exposure to the blood of her foetus; can cause foetal haemolysis in subsequent pregnancies
a mild viral infection (also known as German measles) that produces a rash and fever; dangerous when it infects a woman during the early stages of pregnancy, when it can spread causing birth defects in the foetus
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