the menstrual cycle Flashcards
the menstrual cycle
Follicular phase
Hypothalamus-> gonadotropin-releasing hormone (GnRH).
Pituitary gland -> follicular stimulation hormone (FSH).
FSH stimulates follicles in the ovaries to grow and mature eggs.
Growing Follicle -> estrogen (E2)
High estrogen->pituitary -> luteinizing hormone (LH) and FSH.
About 24 hours after the LH surge(peak)-> ovulation
Post ovulation-> corpus luteum (the empty follicle) produces progesterone/estradiol
Luteal phase begins
Estradiol (E2) - day 1-4 - what levels are normal?
(ester is pg)
<80 pg/ml
Estradiol (E2) - day 5-14
100+ pg/ml
(Rises in relation to growing follicles )
Follicle Stimulating Hormone (FSH) - day 1-4
(I and U are follicles)
<10 IU/ml
LH - day 1-4
<10 IU/ml
LH - day 5-14
> 15 (surge) mIU/ml
Depends on lab assay, etc..could be as low as >12 (most will be well about ~ >20 or higher
progesterone (P4) - day 1-14
<1.5 ng/ml
progesterone (P4) - after ovulation
(progy is 1 1/2 to 2 1/2)
> 2.5 ng/ml
abnormal results E2 - day 1-4
> 100 pg/ml, causes - Functional Ovarian cyst, Perimenopause
abnormal results E2 - day 1-4 - implications - think about what E2 does
Delayed treatment start
Suppresses FSH level
FSH - abnormal results - day 1-4
> 15 IU/ml - causes - Perimenopause
Checked on day of LH surge
FSH - abnormal results E2 - day 1-4 - implications
Decreased egg quality
FSH invalid due to the normal surge on day of LH surge
LH - abnormal results - greater than 15 - day 1-4, preovulatory
(lutenize my PCOS)
> 15 mIU/ml, causes - PCOS
LH - abnormal results - 1-4, preovulatory
May advise false reading on OPK
P4 - Luteal phase - abonormal results - less than 2.5 - and causes? (tested 7 days after ovulation)
(Progy is small)
<2.5 ng/ml - cause -Anovulation