Understanding the marker
IGF-1 carries some of the effects of growth hormone in the body. It is measured to help investigate specific questions about growth-hormone activity.
The appropriate age-related interval is essential when interpreting IGF-1. Nutrition, liver function and treatments can also affect it. It is not a validated measure of biological age, training readiness or recovery.
What does high IGF-1 mean?
A high IGF-1 may reflect increased growth-hormone activity. The age-related interval, symptoms and confirmatory tests are needed before drawing a diagnostic conclusion.
What does low IGF-1 mean?
A low IGF-1 needs an age-appropriate comparison and information about nutrition, health and treatment. It may lead to further hormone testing when the clinical question supports it, but does not establish a deficiency alone.
More markers in the same area
This is general information about the marker, not an assessment of your values and not medical advice. Last updated: October 2026.