Gonadotropin Releasing Hormone Test

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Paediatric & Adolescent Endocrinology Yorkshire Regional Centre Leeds Children’s Hospital Gonadotrophin Releasing Hormone (GnRH) test http://www.pathology.leedsth.nhs.uk/dnn_bilm/Investigationprotocols/Pituitaryprotocols/GnRHTest.aspx Indication To diagnose hypothalamic-pituitary disease in precocious and delayed puberty in both sexes in those children with low basal gonadotrophins. Contra-indications This test may be performed simultaneously with TRH or glucagon as part of triple pituitary test. Principle GnRH (gonadotrophin releasing hormone) is a decapeptide secreted by the hypothalamus which stimulates the production and secretion of LH and FSH by the anterior pituitary. Side effects GnRH may rarely cause nausea, headache and abdominal pain. Preparation No specific patient preparation is required. Requirements 3 plain tubes Drug administration: GnRH (Gonadorelin) 2.5 microgram/kg to a maximum of 100 microgram Procedure take 2 mL blood for LH & FSH and testosterone (males) and oestradiol time 0 min (females) immediately give GnRH IV as a bolus (dose as above) time 20 min take 2 mL blood for LH & FSH time 60 min take 2 mL blood for LH & FSH Interpretation 1. Normal basal reference values in prepubertal children are: LH < 2.0 IU/L FSH < 2.0 IU/L 2. Following GnRH, the response may be considered normal if the basal values are in the reference range and there is at least a doubling at 20 min for LH and FSH. The response varies throughout the menstrual cycle: early (D4) < late follicular (D11) = "luteal" (D21), max response occurs at the mid- cycle (D14). 3. An exaggerated response is seen in primary & secondary gonadal failure. 4. A flat response in gonadotrophins (< 5 IU/L) occurs in prepubertal children and with pituitary and/or hypothalamic disease. However, a normal response does NOT exclude pituitary or hypothalamic disease since the response will be affected by the exact anatomy of the disorder. 5. The magnitude of the LH response is proportional to the mean nocturnal LH and therefore the evolution of puberty. 6. In central precocious puberty the LH is greater than the FSH. References: see website link above Paediatric Endocrinology Tests: Valid June 2017 to Dec 2020 .

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