Table 1.

Effect of chronic phosphorus loading on serum and urinary calcium and phosphorus values and intact PTH valuesa

CategorySerum ValuesUrine Values
Ca2+ (mM)PO4 (mM)PTH (pg/ml)PO4 (mM/24 h)PO4 Clearance (ml/min)Ca (mM/24 h)FECa (%)
aReprinted with permission from The American Journal of Physiology (35). Results are given as mean ± SEM. PTH, parathyroid hormone.
bP < 0.05 for comparison with previous steady-state period (control or phosphate loading).
cP < 0.01 for comparison with previous steady-state period (control or phosphate loading).
Control1.33 ± 0.030.91 ± 0.1724.4 ± 4.543 ± 335 ± 107.40 ± 0.441.8 ± 0.4
Phosphate loading
day 11.29 ± 0.03b1.20 ± 0.15b58.3 ± 18.7c213 ± 7c129 ± 24c3.38 ± 0.30c0.8 ± 0.2c
days 5 to 71.34 ± 0.020.77 ± 0.1061.7 ± 13.0c240 ± 9c229 ± 35c3.92 ± 0.33c0.9 ± 0.3c
Recovery
day 11.38 ± 0.020.56 ± 0.12c26.5 ± 4.275 ± 590 ± 325.73 ± 0.361.4 ± 0.3
days 4 to 61.35 ± 0.020.81 ± 0.2023.8 ± 4.544 ± 540 ± 138.72 ± 0.681.9 ± 0.3