<prompt> Which of the following biochemical findings are seen in osteoporosis?Low Ca, high P04. high alkaline phosphataseLow Ca. low P04. low alkaline phosphataseNormal Ca, normal PO4, normal alkaline phosphataseLow Ca, low P04, normal alkaline phosphatase  <response>: In osteoporosis the levels of calcium, PO4, alkaline phosphatase and parathyroid hormone are normal. Vitamin D deficiency is commonly associated with this condition. Osteoporosis is a skeletal disorder characterized by a loss of bone osteoid that reduces bone integrity, resulting in an increased risk of fractures. Most common causes are aging, use of steroids, alcoholism, smoking and sex hormone deficiency. According to WHO, osteoporosis is defined as a bone density that falls 2.5 standard detions SD below the mean for young healthy adults of the same sex. Ref: Fitzgerald P.A. 2013. Chapter 26. Endocrine Disorders. In M.A. Papadakis, S.J. McPhee, M.W. Rabow, T.G. Berger Eds, CURRENT Medical Diagnosis Treatment 2014. 