FGF23 and hydrops fetalis: In the groups receiving NP, even though P load was similar, rats fed HF diets showed consistently higher plasma FGF23 concentrations than rats fed NF diets: rats with intact renal function fed NP, 593 ± 126 pg/ml vs 157 ± 28 pg/ml (p < 0.01), and 1/2Nx rats fed NP, 538 ± 105 pg/ml vs 250 ± 18 pg/ml (p < 0.05).