Growth Hormone, Stimulation and Suppression Tests

Growth Hormone, Stimulation and Suppression Tests is a topic covered in the Davis's Lab & Diagnostic Tests.

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Synonym/Acronym:
Somatotropic hormone, somatotropin, GH, hGH.

Rationale
To assess pituitary function and evaluate the amount of secreted growth hormone (GH) to assist in diagnosing diseases such as giantism and dwarfism.

Patient Preparation
There are no medication restrictions unless by medical direction. The patient should fast and avoid strenuous exercise for 12 hr before specimen collection. Protocols may vary depending on the type of induction used.

Normal Findings
Method: Immunoassay.


Growth Hormone
AgeConventional UnitsSI Units (Conventional Units × 1)
Cord blood8–40 ng/mL8–40 mcg/L
1 d5–50 ng/mL5–50 mcg/L
1 wk5–25 ng/mL5–25 mcg/L
Child2–10 ng/mL2–10 mcg/L
Adult
 Male0–5 ng/mL0–5 mcg/L
 Female0–10 ng/mL0–10 mcg/L
 Male older than 60 yr0–10 ng/mL0–10 mcg/L
 Female older than 60 yr0–14 ng/mL0–14 mcg/L
Stimulation Tests
Rise above baselineGreater than 5 ng/mLGreater than 5 mcg/L
Peak responseGreater than 10 ng/mLGreater than 10 mcg/L
Suppression Tests0–2 ng/mL0–2 mcg/L

Critical Findings and Potential Interventions
N/A

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