1). Osteoporosis : Normal labs, there's just low bone mass
2). Osteopetrosis: Normal labs, but there are thickened, dense bones
3). Osteomalacia (adults) & rickets (children): LOW Ca, LOW Phosphate, HIGH PTH. Bones are soft.
4). Osteitis fibrosis cystica: LOW Phospate, HIGH Ca, HIGH ALP, HIGH PTH. Brown tumors
5). Paget's disease: HIGH ALP. Abnormal bone architecture, increased hat size, hearing loss
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