The Claim
In pregnant women, serum ferritin, transferrin receptor, and calculated body iron stores are statistically significant predictors of thyroid-stimulating hormone (TSH) and total thyroxine (TT4) concentrations, with standardized beta coefficients indicating the direction and magnitude of these relationships (ferritin β = -0.506 for TSH, β = 0.679 for TT4; all P < 0.0001).
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In pregnant women, levels of iron-related markers in the blood are statistically linked to the levels of thyroid-stimulating hormone and total thyroxine.
See the scientific wording
In pregnant women, serum ferritin, transferrin receptor, and calculated body iron stores are highly significant predictors of both thyroid-stimulating hormone (TSH) and total thyroxine (TT4) concentrations, with standardized beta coefficients indicating strong statistical relationships (e.g., ferritin β = -0.506 for TSH, β = 0.679 for TT4; all P < 0.0001).
When iron levels are low, the thyroid gland cannot make enough thyroid hormone because the enzyme that needs iron to work stops functioning properly. This causes the body to produce more signal to the thyroid to make more hormone, which raises TSH, while the actual hormone levels in the blood drop.
What the research says
1 studyStudy: Iron deficiency predicts poor maternal thyroid status during pregnancy.
When pregnant women don’t have enough iron, their thyroid hormone levels tend to drop and their TSH (a thyroid signal) goes up — this study found a clear link between low iron and these thyroid changes.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.