SPINA-GD (SPINA-GD)
Estimate of peripheral T4 to T3 conversion.
Enter values
Â
Value
Unit
fT4
fT3
SPINA-GD ranges
According to Dietrich et al. (2016), SPINA-GD should be between 20 and 60:
20
Risk Scale
Optimal range for SPINA-GD appears to be between 25 and 35:
0
20
25
35
40
60
Why this optimal range?
Reference range 20-40 nmol/s as defined in SPINA-THYR software.
Ranges in red are: ±2xSD from the mean, ranges in yellow are ±1.5-2xSD from the mean.
Ranges in red are: ±2xSD from the mean, ranges in yellow are ±1.5-2xSD from the mean.
Estimate of peripheral T4 to T3 conversion.
SPINA-GD estimates the maximum T3 production capacity from T4 by peripheral deiodinases under substrate saturation. Unlike simple FT3/FT4 ratios, it accounts for nonlinear enzyme kinetics.
SPINA-GD interpretation
For low
Low SPINA-GD indicates reduced peripheral T4-to-T3 conversion.
For high
High SPINA-GD indicates increased peripheral T4-to-T3 conversion.
About the site author
My personal mission is to extend human lifespan by collectively adding 1 million years to people's lives.
That’s why I made this site 100% free—no sign-up, no email. Just instant results.
Zsolt SzaboPrecision Health Consultant for Longevity Clinics, Biohacker, and Software Engineer
How would you improve this tool ?
Any feedback is welcome at .