<prompt> Which of the following is seen in osteoporosis-Low Ca, high PO4, high alkaline phosphataseLow Ca, low PO4, low alkaline phosphataseNormal Ca, normal PO4, normal alkaline phosphataseLow Ca, low PO4, normal alkaline phosphates  <response>: Serum calcium, phosphate and alkaline phosphatase are normal in osteoporosis. aboratory diagnosis and Biochemical assessment of osteoporosis Serum and urine calcium. Alkaline phosphatase. Hydroxyproline. Ostecalcin. Hydroxylysine glycosides. Procollagen I extension peptides Crosslink assays Alpha2 HS glycoprotein Acid phosphatase Biochemical estimation of bone loss. Ref: Ebnezar 4the p.669 