BACKGROUND: Elevated early follicular phase (EFP) FSH is frequently observed in subfertile patients. In these women, temporary normalization of FSH concentrations is known to occur. We studied the complete endocrine cycle profile of subfertile young women with elevated basal FSH compared with controls. METHODS Daily bloodsampling and ultrasound monitoring in the follicular phase was performed in 22 patients with elevated basal FSH levels (identified in screening) and in 16 controls during one menstrual cycle and for 5 days of the next cycle. RESULTS: Eleven patients showed elevated basal FSH levels in the study cycle ('High, High'; H,H group) whereas 11 had normalized basal FSH levels ('High, Low'; H,L group). Anti-Müllerian hormone (AMH) was lower in both groups. In the H,H group, FSH was higher in all phases of the cycle and both inhibin A and B were lower during the EFP. In the H,L group, FSH was also higher than in controls in the EFP and the late luteal phase and inhibin A was higher in the periovulatory phase. 'Normalization' of Day 3 FSH in women with previously elevated FSH was associated with normalization of inhibin B levels in the preceding luteal phase. CONCLUSIONS: The endocrine cycle profile in younger subfertile patients with consistently elevated basal FSH resembles that in published data from older women and also reflects a low ovarian reserve. Normalization of FSH in association with normal inhibin B suggests a temporary increase of the available cohort.
BACKGROUND: Elevated early follicular phase (EFP) FSH is frequently observed in subfertile patients. In these women, temporary normalization of FSH concentrations is known to occur. We studied the complete endocrine cycle profile of subfertile young women with elevated basal FSH compared with controls. METHODS Daily bloodsampling and ultrasound monitoring in the follicular phase was performed in 22 patients with elevated basal FSH levels (identified in screening) and in 16 controls during one menstrual cycle and for 5 days of the next cycle. RESULTS: Eleven patients showed elevated basal FSH levels in the study cycle ('High, High'; H,H group) whereas 11 had normalized basal FSH levels ('High, Low'; H,L group). Anti-Müllerian hormone (AMH) was lower in both groups. In the H,H group, FSH was higher in all phases of the cycle and both inhibin A and B were lower during the EFP. In the H,L group, FSH was also higher than in controls in the EFP and the late luteal phase and inhibin A was higher in the periovulatory phase. 'Normalization' of Day 3 FSH in women with previously elevated FSH was associated with normalization of inhibin B levels in the preceding luteal phase. CONCLUSIONS: The endocrine cycle profile in younger subfertile patients with consistently elevated basal FSH resembles that in published data from older women and also reflects a low ovarian reserve. Normalization of FSH in association with normal inhibin B suggests a temporary increase of the available cohort.
Authors: Marleen van den Berg; Marloes van Dijk; Julianne Byrne; Helen Campbell; Claire Berger; Anja Borgmann-Staudt; Gabriele Calaminus; Uta Dirksen; Jeanette F Winther; Sophie D Fossa; Desiree Grabow; Victoria L Grandage; Marry M van den Heuvel-Eibrink; Melanie Kaiser; Tomas Kepak; Leontien C Kremer; Jarmila Kruseova; Claudia E Kuehni; Cornelis B Lambalk; Flora E van Leeuwen; Alison Leiper; Dalit Modan-Moses; Vera Morsellino; Claudia Spix; Peter Kaatsch; Eline van Dulmen-den Broeder Journal: JMIR Res Protoc Date: 2018-09-14