This test is appropriate for patients who have already had recent testing for calcium values and would like results graphed. Previous calcium values must be submitted with the test order; otherwise, a generic result will be provided. If calcium values are not available and a graphed result is desired, do NOT collect in EDTA and order Parathyroid Hormone, Intact with Calcium (ARUP test code 0070172). If requesting Ionized Calcium with PTH, submit two (2) separate specimens. Refer to Calcium, Ionized, Serum (ARUP test code 0020135) for requirements.