<prompt> BMR changes by what in pregnancyRise by 25Fall by 25Rise by 50Fall by 50  <response>: Ans. A. Rise by 25 During pregnancy glomerular filtration rate increases, which causes increased renal clearance of iodine. Maternal serum iodine levels fall due to increased renal loss and also due to transplacental shift to the fetus. These cause hyperplasia of the gland. 