RT Book, Section A1 Kecskes, Susan A. A2 Schafermeyer, Robert A2 Tenenbein, Milton A2 Macias, Charles G. A2 Sharieff, Ghazala Q. A2 Yamamoto, Loren G. SR Print(0) ID 1105684328 T1 Hypo and Hypercalcemia Abnormalities T2 Strange and Schafermeyer's Pediatric Emergency Medicine, 4e YR 2014 FD 2014 PB McGraw-Hill Education PP New York, NY SN 978-0-07-182926-7 LK accessemergencymedicine.mhmedical.com/content.aspx?aid=1105684328 RD 2024/04/24 AB Less then one percent of the body's calcium is in the circulation.Only the ionized form of circulating calcium is physiologically active.Parathyroid hormone (PTH), vitamin D, and calcitonin are the hormones that control calcium levels.IV calcium can be given as calcium chloride or calcium gluconate but the mg doses are different.IV calcium is very irritating to tissues and veins.