IGF-1
IGF-1 (insulin-like growth factor 1) is a hormone produced primarily by the liver in response to growth hormone. It mediates many of the growth-promoting effects of growth hormone on bones, muscles,…
Category: Hormones
Also known as: igf-1, igf1, insulin-like growth factor 1, insulin like growth factor, somatomedin c
Reference range: 100–400 ng/mL (Source: ABIM)
Standard unit: ng/mL
High values may indicate
High IGF-1 levels may indicate acromegaly (excess growth hormone in adults), gigantism in children, or growth hormone-secreting pituitary tumors.
Low values may indicate
Low IGF-1 levels may indicate growth hormone deficiency, pituitary disorders, liver disease, malnutrition, or hypothyroidism, and can contribute to short stature in children and muscle weakness in adults.
Frequently asked questions
- What is a normal IGF-1 level?
- A typical reference range for IGF-1 is 100–400 ng/mL (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is IGF-1 measured in?
- IGF-1 is most commonly reported in ng/mL. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do IGF-1 reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track IGF-1 over time?
- Yes. Upload results from any lab and BloodId charts your IGF-1 over time against its reference range, so you can see whether the trend is rising, falling, or stable.