This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Which of the following is seen in osteoporosis- 
Select and explain. 
A. Low Ca, high PO4, high alkaline phosphatase, B. Low Ca, low PO4, low alkaline phosphatase, C. Normal Ca, normal PO4, normal alkaline phosphatase, D. Low Ca, low PO4, normal alkaline phosphates
C: Normal Ca, normal PO4, normal alkaline phosphatase
Answer: C: Normal Ca, normal PO4, normal alkaline phosphatase 
Explanation: *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 4th/e p.669