Relationship of Serum Calcium, Magnesium and Inorganic Phosphorus levels during various Menstrual Phases in Adolescent Girls

In fifty healthy adolescent girl volunteers serum calcium, magnesium and inorganic phosphorus were estimated serially during various menstrual phases. The result shows significant cyclic variations within physiological limits. Serum calcium was highest during ovulatory phase (p<O.OO I) and lowest during luteal phase (p<O.OO 1) as compared to other phases. The levels of serum magnesium were observed in opposite direction. It was highest during menstrual phase and lowest during ovulatory phase (p<O.OO 1). The highest levels of inorganic phosphrous were seen in menstrual phase as compared to other phases (p<O.OO I). The influence of cyclic variations of the ovarian hormones probably results in these changes.