Hormones
Insulin-Like Growth Factor 1 (IGF-1)
Also known as: IGF-I, Somatomedin C
CONVERT & COMPARE
ng/mL
=
41.8
nmol/L
=
320
µg/L
=
320
mcg/L
=
320
ug/L
Reference ranges by source
Published adult intervals: 63, from 4 named sources, shown in ng/mL.
SOURCE
SEX
AGE
RANGE
VISUAL
CITE
About Insulin-Like Growth Factor 1 (IGF-1)
This test measures the amount of IGF-1 (insulin-like growth factor 1) in your blood. IGF-1 is a hormone, a chemical messenger in your bloodstream that controls the actions of certain cells or organs.
IGF-1 manages the effects of growth hormone (GH) in your body. Together, IGF-1 and GH promote normal growth of bones and tissues.
GH levels in the blood change throughout the day, depending on your diet and activity levels. But IGF-1 levels are more stable. So an IGF-1 test is often a good measure of the average amount of GH being produced by the body.
Main source: MedlinePlus ↗
Useful for
Help diagnose GH deficiency
Help diagnose GH insensitivity, also known as Laron syndrome
Help diagnose gigantism in children
Help diagnose acromegaly in adults
Monitor treatment for a GH disorder
Main source: MedlinePlus ↗
Interpretation
If your child's results show lower than normal levels of IGF-1, it probably means they have a GH deficiency or insensitivity to GH.
Higher than normal levels of IGF-1 may mean gigantism in children or acromegaly in adults.
For general wellness information only. Talk to a clinician about your specific results.
Main source: MedlinePlus ↗
Track your insulin-like growth factor 1 (igf-1) in MyBloodTest
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Related biomarkers
More tests in the hormones category.
Sources
Last updated 2026-05-02
This page presents source-specific reference data and sourced explanations. For general wellness information only. This is not medical advice. For diagnosis or treatment of any condition, talk to a qualified clinician.