PTH and acute kidney injury: Testing showed a slightly elevated calcium (11.2 mg/dL; 2.8 mmol/L) with concomitant AKI (creatinine 2.5 mg/dL; 224 μmol/L), suppressed parathyroid hormone PTH (8.8 pg/mL; 0.9 pmol/L) (RR, 18-88 pg/mL; 1.9-9.3 pmol/L), and normal 25(OH)D (58.8 ng/mL; 147 nmol/L) (RR, 30-100 mg/mL; 75-250 nmol/L).