PTHLH and Hypercalcemia: As noted by Winter et al. [30], this apparent hypercalcemia during either gestation or the postpartum period is colloquially termed ‘pseudohyperparathyroidism’ and is understood to be a result of parathyroid hormone-related peptide (PTHrP), a hormone responsible for humoral hypercalcemia of malignancy, first isolated and purified in 1987 [31].