Which of the following is true regarding Brooke Delaney Dr. Dowers

Question 6 / 25: Which of the following is true regarding LDDS test results for a dog: Baseline is 10 ug/dl cortisol; 4 hr is 6 ug/dl cortisol; 8 hr is at 4 ug/dl ?

A This dog has hyperadrenocorticism secondary to pituitary dependent tumor.

B This dog has hyperadrenocorticism secondary to adrenal tumor

C This dog has hyperadrenocorticism but cannot determine whether pituitary dependent or adrenal
tumor

D This dog is normal

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Explanation:

The cortisol concentration is 10 µg/dl at baseline and 4 µg/dl eight hours after dexamethasone administration, thus the dog exhibits at least 50% cortisol suppression at some point during the test, which is diagnostic for PDH.

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Dr. Dowers Endocrinology Quiz 2

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