Given these results, a thyroid hormone screening could
be useful in those cases of CF refractory to common therapies.
In this investigation, a slight decrease in fT4 circulating
levels, with no effect on fT3 blood concentrations was
detected. Should fT3 be lower than its physiologic levels
(Anderson et al., 1988; Nixon et al., 1988), a therapeutic
approach based on l-thyroxine administration could be
attempted, as it routinely occurs in human medicine.
estrogen.