Study Year Author Study Subjects Population FGF-23 levels Other Parameters included 2003 Jonsson et al.[22] 141 adult Caucasians 55  ±  50 RU/ml Normal Phosphate 2003 Weber et al.[4] 42 adults Caucasians Median 13 RU/ml (5 to 210) Ca2+ 9.5 ± 0.1 mg/dl, PO4 3.7 ± 0.1mg/dl, median creatinine 0.9 (0.6–1.3) mg/dl, median iPTH 34 (11–77). 2005 Ferrari et al.[24] 29 healthy males Swiss 48.3 ± 4.6 RU/ml Serum Phosphate  3.90 ± 0.09 mg/dl, PO4 intake 1400 ± 100 mg, TmP/GFR  3.57 ± 0.09 mg/dl, PTH  26 ± 2.1 pg/ml, 1, 25 OH vit D  37.5 ± 1.0 pg/ml. 2009 Laroche et al.[12] 15 adults French  39.1  ±  16.4 RU/ml Serum phosphate 3.2 ± 0.5 mg/dl, PTH  21 ± 8 pg/ml, Ca2+ 9.7 ±  0.8 mg/dl 2015 Abbas et al. 80 healthy adults Pakistani Median 49.9 RU/ml (33-76.1) Serum phosphate 3.35 ±  3.91 mg/dl, dietary Phosphate 1220 ± 426 mg, TmP/GFR 3.04 ± 0.57 mg/dl, FePO4 7.0 ± 4.7 %

Table 5: Various studies reporting FGF-23 levels in healthy controls.