PTH and Hypercalcemia: Sato [55] described a case of a 28-year-old female without a diagnosis of hypoparathyroidism who developed symptomatic postpartum hypercalcemia (corrected calcium 19.4 mg/dL) (in the absence of lactation), alongside suppressed PTH and elevated PTHrP; the author suggested the cause of the hypercalcemia is likely due to PTHrP hypersecretion from the placenta.