Calcitonin Test Test
A calcitonin test measures the level of calcitonin in your blood. Calcitonin is a hormone made in your thyroid gland that helps control calcium levels. High levels may be a sign of medullary thyroid cancer or C-cell hyperplasia.
What this test measures
A calcitonin test measures the level of calcitonin in a sample of your blood. Calcitonin is a hormone that helps control the level of calcium in your blood. It is made in your thyroid gland by cells called 'C cells.'
What your results mean
Reference ranges vary by laboratory and by your age and sex. MedlinePlus does not publish a single normal range for this test — always read your result against the range printed on your own lab report and discuss it with your provider.
Higher-than-normal results
A high calcitonin level means that the C cells in your thyroid are making too much calcitonin. The higher the level, the more likely it is that you have medullary thyroid cancer or C-cell hyperplasia. But high levels may also be caused by other conditions, certain medicines, or pregnancy.
Lower-than-normal results
A low calcitonin level is not known to be a medical problem.
Frequently asked questions
What is a calcitonin test?
A calcitonin test measures the level of calcitonin in your blood. Calcitonin is a hormone made in your thyroid gland that helps control calcium levels.
Why might I need a calcitonin test?
Your provider may order this test if you have symptoms of medullary thyroid cancer or C-cell hyperplasia, or if these conditions run in your family. It is also used to monitor treatment or check for cancer returning.
What does a high calcitonin level mean?
A high calcitonin level may mean you have medullary thyroid cancer or C-cell hyperplasia. However, other conditions, certain medicines, or pregnancy can also cause high levels.
What does a low calcitonin level mean?
A low calcitonin level is not known to be a medical problem.
Can a normal calcitonin level rule out medullary thyroid cancer?
No, a normal calcitonin level does not rule out medullary thyroid cancer or C-cell hyperplasia, because these conditions do not always cause high calcitonin.
Related lab tests
Sources
- MedlinePlus: Calcitonin Test — NIH MedlinePlus
Last updated . Information is aggregated from official public sources and is not a substitute for professional medical care.