A 52 year old woman presented to the clinic for ongoing fatigue and weight loss during the last 6 weeks. She thinks she's loss at least "10 pounds". For the past week and a half she's noted some progressing 'muscle cramping' tetany, as well as 'tingling' sensation around her mouth and lower extremities. She's also noted some intermittent colicky abdominal pain. On your exam, you noted a positive Chvostek's sign. PMH: 20 year history of Crohn's disease. She also tells you that she is a practicing vegan.