IGF-1 Z-Score
The IGF-1 Z-score expresses IGF-1 as standard deviations from the age- and sex-specific mean, which is useful because IGF-1 declines steeply with age. A score near zero is average for age, while values near +2 or -2 suggest growth hormone excess or deficiency, respectively. It helps avoid misclassifying normal age-related changes as disease.
2 providers include this
Advanced / Specialty Markers
-2.0 to +2.0 (normal range)
What is IGF-1 Z-Score?
The IGF-1 Z-score expresses IGF-1 as standard deviations from the age- and sex-specific mean, which is useful because IGF-1 declines steeply with age. A score near zero is average for age, while values near +2 or -2 suggest growth hormone excess or deficiency, respectively. It helps avoid misclassifying normal age-related changes as disease.
Why It Matters
Compares IGF-1 to age-matched population. More meaningful than absolute IGF-1 value. Helps identify growth hormone deficiency or excess relative to peers.
Which Providers Test IGF-1 Z-Score?
Full Provider Comparison
| Provider | Includes | Annual Cost | Biomarkers |
|---|---|---|---|
 Superpower | — | $199 | 100+ (150 with ratios) |
 WHOOP Advanced Labs | — | $349 | 65 |
 Labcorp OnDemand | — | $398 | 40+ |
| — | $486 | 40+ | |
| — | $449 | 288 | |
| — | $349 | 100+ | |
| — | $829 | 54 | |
 Function Health | — | $365 | 160+ |
| — | $250 | 65 | |
| — | $495 | 80+ | |
| — | $895 | 100+ | |
| — | $1950 | 130+ | |
| — | $375 | 95+ | |
| — | $Varies | 75+ | |
| — | $190 | 100+ | |
| — | $99 | 50 | |
| — | $124 | 60 | |
| ✓ | $349 | 130+ | |
| — | $349 | 80+ | |
| — | $375 | 85 | |
| ✓ | $700 | 128 | |
| — | $99 | 100+ |
Frequently Asked Questions
What is IGF-1 Z-Score?
The IGF-1 Z-score expresses IGF-1 as standard deviations from the age- and sex-specific mean, which is useful because IGF-1 declines steeply with age. A score near zero is average for age, while values near +2 or -2 suggest growth hormone excess or deficiency, respectively. It helps avoid misclassifying normal age-related changes as disease.
What is the optimal range for IGF-1 Z-Score?
The standard reference range for IGF-1 Z-Score is -2.0 to +2.0 (normal range). Optimal ranges may differ based on individual health goals and expert recommendations.
Which blood test providers include IGF-1 Z-Score?
2 out of 22 blood testing providers include IGF-1 Z-Score in their panels. This biomarker has limited availability.
What category does IGF-1 Z-Score fall under?
IGF-1 Z-Score is categorized under Advanced / Specialty Markers. This category includes biomarkers that help assess related aspects of health and wellness.
Medical Disclaimer
This information is for educational purposes only and is not medical advice. Always consult with a qualified healthcare provider about your specific health needs.
Last reviewed:2026-04-12