The research aims to characterize changes in ovarian and pituitary hormones associated with the development of ovarian follicular waves during the human menstrual cycle.
Our laboratory's previous research has demonstrated that multiple waves of ovarian follicles develop throughout the menstrual cycle. Approximately 2/3 of women develop 2 follicle waves throughout their cycle while the remainder exhibit 3 waves of follicle growth (1,2). This study is to follow up on those findings to determine how pituitary and ovarian hormones regulate the development of follicle waves in women, with a combination of ultrasound scans and blood and urine sampling to characterize how follicles grow during the menstrual cycle in 50 women of reproductive age. Changes in follicle growth across the cycle will be compared with changes in hormone production. The new findings will be essential for improving understanding of female reproduction, with clinical applications in contraception, fertility and menopausal care for women across their reproductive lifespan.
Study Type
OBSERVATIONAL
Enrollment
50
Transvaginal ultrasound scans to map ovarian follicle growth and ovulation, finger-prick blood sampling for dried blood spot (DBS) hormonal assays and urine sampling for hormone metabolites, every consecutive day for an interovulatory interval. Weekly venipuncture samples will be taken for standard ELISA hormonal assays. The hormones of interest are FSH, LH, estradiol, progesterone, AMH, inhibins A and B, GDF-9 and BMP-15.
University of Saskatchewan
Saskatoon, Saskatchewan, Canada
Antral follicle diameter
Daily diameters of individual follicles ≥ 2mm from ultrasound examination
Time frame: One menstrual cycle (21-35 days) per volunteer
Antral follicle count
Daily count of the number of follicles \>2 mm from ultrasound examination
Time frame: One menstrual cycle (21-35 days) per volunteer
Follicle stimulating hormone (FSH) serum level
Daily measurements of FSH in IU/L
Time frame: One menstrual cycle (21-35 days) per volunteer
Luteinizing hormone (LH) serum level
Daily measurements of LH in IU/L
Time frame: One menstrual cycle (21-35 days) per volunteer
Estradiol serum level
Daily measurements of estradiol in pg/mL
Time frame: One menstrual cycle (21-35 days) per volunteer
Progesterone serum level
Daily measurements of progesterone in ng/mL
Time frame: One menstrual cycle (21-35 days) per volunteer
Anti-mullerian hormone (AMH) serum level
Daily measurements of AMH in ng/mL
Time frame: One menstrual cycle (21-35 days) per volunteer
Inhibin A serum level
Daily measurements of inhibin A in pg/mL
Time frame: One menstrual cycle (21-35 days) per volunteer
Inhibin B serum level
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Daily measurements of inhibin B in pg/mL
Time frame: One menstrual cycle (21-35 days) per volunteer