How are FT4 and Fruchtbarkeit related?

Free thyroxine (FT4) is a key thyroid hormone, and thyroid function is well-established to influence fertility. Both hypothyroidism and hyperthyroidism can disrupt ovulation, menstrual regularity, and implantation. However, FT4 alone is not a direct fertility marker; TSH is the primary screening test. The evidence is based on robust endocrinological research, but the predictive value of a single FT4 measurement for fertility outcomes is limited. MyBody-X tests may include thyroid markers, but they are not diagnostic for fertility issues. Caveat: Normal FT4 does not rule out subclinical thyroid dysfunction, which can still affect fertility. Anyone with fertility concerns should consult an endocrinologist for comprehensive evaluation.