Hi, I Had A Blood Test Oddly And The Nurse

Hi, I had a blood test oddly and the nurse phoned me and told me my ionized calcium levels were a little hot. I have Cancer and will be undergoing my third chemo treatment on the 29th. She informed me to get my blood tested at the lab before my treatment. I am looking for information on this. is it serious? Will it interfer with my treatments? Did my chemo cause this condition?