PTHLH and Hypercalcemia: Shi et al. [60] presented a 27-year-old postpartum, lactating female with no known history of hypoparathyroidism, demonstrating suppressed PTH and hypercalcemia (3.45 mmol/L) (13.83 mg/dL); the authors did not measure PTHrP but suggested that this is the most likely explanation after ruling out other causes.