[Behaviour of Butanol-extractable iodine in serum, during and after long-time application of hormonal contraceptives (author's transl)].

The behaviour of butanol-extractable iodine in serum was tested, during and on completion of administration of Non-Ovlon, Ovosiston, Gravistat, and Deposiston, the latter being a longacting contraceptive. Action of synthetic sexual steroids led to an increase in butanol-extractable iodine. However, this change proved to be easily reversible, soon after the end of medication, even after long-time application. Yet, complete normalisation should not be expected to occur before the second cycle without contraceptives, which applies, in particular, to women who had been on long-acting contraceptives.