Fig. 3From: Nonthyroidal illness syndrome (NTIS) in severe COVID-19 patients: role of T3 on the Na/K pump gene expression and on hydroelectrolytic equilibriumCorrelation between FT3 serum levels and hydration (a) and between FT3 serum levels and Nae:Ke ratio (b). The coefficient of correlation r is reported. In our lab FT3 values under 1.0 pg/ml are not measured. They are classified as < 1Back to article page