Which of the following endocrine markers is used as a diagnostic indicator for growth hormone deficiency in children?

A Insulin-like growth factor-1 (IGF-1) ✓
B Thyroid-stimulating hormone (TSH)
C Adrenocorticotropic hormone (ACTH)
D Follicle-stimulating hormone (FSH)

Explanation

IGF-1 is a protein produced in response to growth hormone stimulation and is used as a diagnostic marker for growth hormone deficiency.

Mnemonic

IGF-1 = 'I Grow Fast' → indicator of growth

Source

Nelson Textbook of Pediatrics
Hormones and Endocrine Markers Pediatric Endocrinology Growth and Development Medium MEDICAL Confidence: high