Fig. 7.

Urinary Ca²⁺ excretion at baseline and 24 h after ip administration of 1,25(OH)₂D₃. Trend lines for urinary Ca²⁺-to-creatine ratio (UCa/Cr) vs. serum Ca²⁺ level are shown for C⁺P⁺ (line A), C⁺P⁻ (line B), and C⁻P⁻ (line C). Note the rightward and downward shift in urinary Ca²⁺ excretion corrected for urinary creatinine as serum Ca²⁺ level increases after 1,25(OH)₂D₃ administration. Data are presented as a scatter plot (n = 8–12/genotype).