Had my thyroid removed on 7/14/08, I was told they wait until pathology comes in if it is malignant they do other treatment before starting Synthroid. I guess if you are doing radiation or other treatment that has to be done first.
I can't answer your question, but I can give you my experience. . .I had a total thyroidectomy on 8/4 and they started me on synthroid (.175) the day after surgery, but I have read on this site of people who have started later.
I'm assuming the od-cal is a calcium supplement?
If it is, good for your doctor, my calcium levels dipped after surgery and I've had a hell of a time getting the levels to stay up.
I'm sure the helpful folks here will give you a more definitive answer.
Best of luck to you & your mom!