Hormones
IGF-1
LOINC 2484-4 · ng/mL
What it is
IGF-1 (insulin-like growth factor 1) is made mainly by the liver in response to growth hormone. It reflects overall growth-hormone activity.
Why it matters
Because it is steadier than growth hormone itself, IGF-1 is used to assess growth-hormone excess or deficiency.
What high values can mean
A higher value can suggest too much growth hormone and needs evaluation.
What low values can mean
A lower value can suggest growth-hormone deficiency or can occur with poor nutrition or some illnesses.
How to improve it
IGF-1 reflects the growth-hormone system; results are interpreted by a specialist rather than changed by lifestyle.
Food & lifestyle
Adequate protein and overall good nutrition support normal IGF-1; major changes are evaluated medically.
Preparing for the test
A blood test; fasting may be requested — follow your lab's instructions.
When to talk to a doctor
Discuss an abnormal IGF-1 with a doctor, who may arrange further hormone testing.
Related markers
Sources
- MedlinePlus (NIH)
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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