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  #1  
Old 11-02-2011
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Question Secondary Amenorrhea and weight loss

An 18 year old nullipara has suddenly stopped menstruating. she recently lost 8.6 kg when she started long-distance running. the laboratory test most consistent with her cause of secondary amenorrhea is which of the following ?

A) a serum prolactin level of 86 ng/ml (normal <20)
B) a serum LH level of 48 mIU/ml (normal 6-35)
C) a serum estradiol level go 128 pg/ml (normal 40-300)
D) a serum FSH level of 3 mIU/ml (normal 5-18)
E) a serum testosterone level of 156 ng/dl (normal 40-110)
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  #2  
Old 11-02-2011
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D) a serum FSH level of 3 mIU/ml (normal 5-18)????


decresed GnRh,decreased LH FSH,decreased estrogen.....this is the cause of amenorrhea
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Old 11-02-2011
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decreased FSH level

Last edited by A_a_; 11-02-2011 at 12:37 PM.
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Old 11-02-2011
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D... secondary ammenorhea would have a central/pituitary cause leading to decrease in GnRH or non pulsatile release of GnRH with fall in gonadotropins
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Old 11-02-2011
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you all got this question right
correct answer is D.
women with amenorrhea owing to weight loss and stress have decreased hypothalamic secretion of GNRH and secondarily decreased FSH & LH. as a consequence serum estradiol levels will be low.
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Old 11-02-2011
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D) a serum FSH level of 3 mIU/ml (normal 5-18)
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