| | Conditions & Treatments | Thyroid Disease What is a normal calcitonin level after thyroidectomy? Typically, after a total thyroidectomy, calcitonin levels are expected to be below the limits of detection for the respective assay, essentially undetectable. Thyroid Disease - Related Articles What Is High Thyroid? Little Known Symptoms of Hypothyroidism Back Pain Caused by Synthroid What are symptoms of high thyroid? Hypothyroid & Weight Loss Can you drink coffee if have hyperthyroidism? What should you do if forgot to bring your thyroid medicine on a trip?