IGF-1
Insulin-like growth factor-1
Low
82.8ng·mL⁻¹Ref 90–360 ng·mL⁻¹
Z -2.11↓ Bad

The card shows an example result of 82.8 ng·mL⁻¹, which is 2.11 SD below the mean.

What it measures

Insulin-like growth factor-1 is made mainly by the liver in response to growth hormone. It drives tissue growth and repair, including muscle protein synthesis.

Reference range

FieldValue
AbbreviationIGF-1
GroupMuscle
Unitng·mL⁻¹
Healthy range90–360
Mean225
SD67.5
Direction↓ Bad — a lowered value is the concern.

The mean is (low + high) / 2 and the SD is (high − low) / 4, so the healthy range covers Z from −2 to +2.

Reading the result

  • High — Not the concern this panel tracks. Very high values can point to excess growth hormone and need a doctor's review.
  • Low — Can reflect poor nutrition, low growth hormone, liver disease, or ageing. Low IGF-1 is linked to muscle loss and frailty.

Notes

  • IGF-1 falls naturally with age, so age-specific ranges are more accurate.
  • This page is general information, not medical advice. Discuss results with a clinician.