Hormone — Growth Axis

IGF-1 (Insulin-like Growth Factor 1)

IGF-1 is the downstream marker of growth hormone signaling, produced primarily by the liver in response to GH.

Reference range

Reference ranges vary by lab, age and sex. Your own lab report carries the authoritative range, and your clinician reads it with you.

Why it matters

IGF-1 is the practical surrogate for growth hormone status because GH itself is pulsatile and difficult to capture on a single draw. It is read in any protocol involving the growth hormone axis (including Sermorelin) to titrate dose and confirm physiologic response. IGF-1 above the upper age-adjusted reference range is the hard ceiling for any growth-axis protocol at REVRCEL.

How REVRCEL clinicians read it

IGF-1 is interpreted against age-adjusted percentiles. Mid-to-upper range is the typical optimization target; supraphysiologic is not.

Included in

Common questions

Why does REVRCEL test IGF-1 instead of growth hormone?

GH is pulsatile and difficult to capture on a single blood draw. IGF-1 is the stable downstream marker.

What IGF-1 level does REVRCEL target?

Mid-to-upper age-adjusted reference. Supraphysiologic IGF-1 is not pursued.

Related biomarkers

Total TestosteroneFasting InsulinHbA1c (Glycated Hemoglobin)

Statements have not been evaluated by the FDA. This page is educational and is not medical advice.

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