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24 results

Menstrual Cycle Physiology: Ovarian Cycle – Brief Overview
LH and FSH are required for follicular development and

Brief Overview LH ... granulosa cells - LH ... following ovulation -> LH ... -> Inhibit FSH/LH

Hypogonadism Differential Diagnosis Algorithm
• Low testosterone, Normal or low LH, Normal or low FSH -

Normal or low LH ... testosterone, Normal LH ... testosterone, Normal LH ... testosterone, Elevated LH

Menstrual Cycle Physiology: Ovarian Cycle – Ovulation Explained

Around Day 14, estrogen exerts sudden +++ positive feedback

understood) -> surge in LH ... production and release LH ... 36 hours after LH

Menstrual Cycle Physiology: Ovarian Cycle – Luteal Phase Explained
• The LH surge can be thought

Explained • The LH ... Day 14 surge in LH ... GnRH, FSH, and LH ... • Decreased LH ... allowing GnRH/FSH/LH

$Causes of Female and Male Infertility - Differential Diagnosis Algorithm Causes of Female Infertility: • Uterus -$

hypogonadism) Low FSH/LH ... problem) High FSH/LH

Diagnosis of Primary Amenorrhea
A diagnostic approach to primary amenorrhea. (FSH = follicle-stimulating hormone; LH = luteinizing

follicle-stimulating hormone; LH

Primary Amenorrhea Differential Diagnosis Framework

Workup:
• β-HCG, TSH and PRL
• Breast Tanner Staging
• FSH,

Staging • FSH, LH

A diagnostic approach to secondary amenorrhea. (DHEA-S = dehydroepiandrosterone sulfate; FSH = follicle-stimulating hormone; LH =

follicle-stimulating hormone; LH

Inhibin <
Hypothalamus
<
GnRH
④
Anterior pituitary
FSH
LH
V
Sertoli cells
V
Leydig cells
Paracrine
e
e
→ #Testosterone

pituitary FSH LH

Sellar / Pituitary Mass - Differential Diagnosis Algorithm
Adenoma - Primary Anterior Pituitary
- Secreting

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