Answer to Question 1
Correct Answer: 1,2
Rationale 1: Tamoxifen (Novadex) blocks the negative feedback of adrenal estrogen to the pituitary and hypothalamus, increasing the levels of FSH and LH to maintain the testosterone level.
Rationale 2: Clomiphene (Clomid) blocks the negative feedback of adrenal estrogen to the pituitary and hypothalamus, increasing the levels of FSH and LH to maintain the testosterone level.
Rationale 3: Sildenafil (Viagra) is not used to treat oligospermia.
Rationale 4: Tadalafil (Cialis) is not used to treat oligospermia.
Rationale 5: Vardenafil (Levitra) is not used to treat oligospermia.
Global Rationale: Tamoxifen (Novadex) and clomiphene (Clomid) block the negative feedback of adrenal estrogen to the pituitary and hypothalamus, increasing the levels of FSH and LH to maintain the testosterone level. Sildenafil, tadalafil, and vardenafil do not have this effect.
Answer to Question 2
Correct Answer: 1,2,3,4
Rationale 1: Serum testosterone level will be done to check for a hormonal cause of erectile dysfunction.
Rationale 2: Prostate-specific antigen will be done to help determine the cause of erectile dysfunction.
Rationale 3: Prolactin level will be done to help determine the cause of erectile dysfunction.
Rationale 4: Thyroxin level will be done to help determine the cause of erectile dysfunction.
Rationale 5: Serum sodium level is not a laboratory test used specifically to determine the cause of erectile dysfunction.
Global Rationale: Serum testosterone level will be done to check for a hormonal cause of erectile dysfunction. Other tests include PSA, prolactin level, and thyroxin level. Sodium level is not specific to the cause of ED.