Serum SHBG levels during normal menstrual cycle and after insertion of levonorgestrel-releasing IUD

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Abstract
Daily serum sex hormone binding globulin (SHBG) levels were measured during normal ovulatory menstrual cycles in ten women between the ages of 23 and 34 by the method of precipitation with ammonium sulfate. The results showed that the mean SHBG levels in a cycle were quite different among individuals, but that the SHBG levels were constant during a certain menstrual cycle. Neither SHBG peaks on day LH-0 (52.64±19.89 nmol/L) (x±SD) nor the mean SHBG levels between the follicular phase (57.10±17.64 nmol/L) and luteal phase (64.75±23.42 nmol/L) show any significant differences. The correlations between the mean SHBG levels and the mean concentrations of progesterone (P), estradiol (E2) and androstenedione during the menstrual cycles were insignificant, whereas the mean SHBG levels during the follicular and luteal phase and on LH-0 day were significantly correlated with the mean concentrations of testosterone (t=0.474;p0.05). The correlation between LNG and SHBG was highly significant (r=0.89,px±SD) ni les niveaux moyens de SHBG entre la phase folliculaire (57,10±17,64 nmol/L) et la phase lutéale (64,75±23,42 nmol/L) ne présentent de différences significatives. Les corrélations entre les niveaux moyens de SHBG et les concentrations moyennes de progestérone (P), oestradiol (E2) et androstènedione pendant les cycles menstruels étaient insignifiants, alors que le niveaux moyens de SHBG pendant les phases folliculaire et lutéale et au jour 0 de LH présentaient des corrélations significatives avec les concentrations de testostérone (t=0,474,p0,05). La corrélation entre LNG et SHBG par contre était très significative (r=0,89px±SD) ni los niveles medios de SHBG entre la fase folicular (57,10±17,64 nmol/L) y la fase lútea (64,75±23,42 nmol/L) presentan diferencias significativas. Las correlaciones entre los niveles medios de SHBG y las concentraciones medias de progesterona (P), estradiol (E2) y androstenediona durante los ciclos menstruales eran insignificantes, mientra sque los niveles medios de SHBG durante las fases folicular y lútea y en el día 0 de LH presentaban correlaciones significativas con las concentraciones de testosterona (t=0,474,p0,05). En cambio, la correlación entre LNG y SHBG era muy significativa (r=0,89p<0,01). Este artículo examina lo que representa esta correlación y el grado de supresión de la función ovárica.