Condition Appearance PTH levels Calcitriol Calcium Phosphates Imprinting Hypoparathyroidism Normal Low Low Low High Not applicable Pseudohypoparathyroidism Type 1A Skeletal defects High Low Low High Gene defect from mother (GNAS1) Type 1B Normal High Low Low High Gene defect from mother (GNAS1 and STX16) Type 2 Normal High Low Low High ? Pseudopseudohypoparathyroidism Skeletal defects Normal Normal Normal[9] Normal gene defect from father