You're treating a patient who is abnormally short and find normal blood levels of growth hormone. Based on this evidence, you determine that

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Normal blood levels of growth hormone suggest that the hormone is being produced and released from the pituitary gland. Therefore, the patient is not lacking a functional pituitary gland (B) or has a tumor (A) affecting the production of growth hormone. Lack of a functional circulatory system (D) would result in a variety of symptoms beyond just short stature. Based on the evidence presented, the most likely explanation for the patient's short stature is a lack of receptors for growth hormone, which would prevent the hormone from exerting its effects on tissues and organs to promote growth.

You're Treating a Patient Who Is Abnormally Short and Find