Pregnancy blood-iodine

Iodine is found in the blood as inorganic and protein-bound iodine, the latter fraction probably representing the circulating thyroid hormone. The total iodine content of normal whole blood is about 8 to 12 /xg. per 100 ml. (range 3 to 30 /xg.) protein-bound iodine varies from 3 to 8 /xg. per 100 ml., with a mean of 5 to 6 /xg. (Chapter 22). The level of protein-bound iodine is increased in pregnancy and in hyperthyroidism and decreased in hypothyroidism. 

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