For evaluation of suspected growth hormone deficiency in short stature, what test is checked?

For evaluation of suspected growth hormone deficiency in short stature, what test is checked?

• A. TSH
• B. Growth hormone levels
• C. ACTH stimulation test
• D. IGF-1 levels only

Answer: (B)

Growth hormone deficiency is diagnosed by testing the pituitary–GH axis’s ability to release GH, not by a single random GH measurement. Because GH is secreted in pulses, a baseline GH level can be normal even if the body can’t mount an adequate GH response when needed. The practical test checks how much GH is released in response to a provocative stimulus; you measure growth hormone levels after stimulation and look for a peak that fails to reach the established threshold. A blunted or absent peak supports GHD. Other options don’t directly prove the axis’s functional capacity: TSH assesses thyroid function, the ACTH stimulation test assesses adrenal axis function, and while IGF-1 levels reflect GH action over time, they are not definitive for diagnosing GH deficiency on their own because they can be influenced by nutrition, liver function, and other factors.

Growth hormone deficiency is diagnosed by testing the pituitary–GH axis’s ability to release GH, not by a single random GH measurement. Because GH is secreted in pulses, a baseline GH level can be normal even if the body can’t mount an adequate GH response when needed. The practical test checks how much GH is released in response to a provocative stimulus; you measure growth hormone levels after stimulation and look for a peak that fails to reach the established threshold. A blunted or absent peak supports GHD.

Other options don’t directly prove the axis’s functional capacity: TSH assesses thyroid function, the ACTH stimulation test assesses adrenal axis function, and while IGF-1 levels reflect GH action over time, they are not definitive for diagnosing GH deficiency on their own because they can be influenced by nutrition, liver function, and other factors.