<prompt> Increased Ca, decreased PO Diagnosis is-Primary hyperparathyroidismSecondary hyperparathyroidism due to Vit D deficiencyMalignancyOsteoporosis  <response>: Ans. is a i.e., Primary hyperparathyroidism Differential diagnosis of various conditions based on Key test results Serum CaSerum phosphrousAlkaline phosphrousPTHo Osteomalacia Rickets Vit. Do Primary hyperparathyroidism bone diseaseTTo Bone disease in renal failure with secondary hyperparathyroidismNo Lytic bone neoplasmsNNNNo OsteoporosisNNNo Pagets diseaseNNN 