Calcitonin, Serum/Plasma — 10 Minutes Post 0.5 mcg/kg IVMedically reviewed by WellAlly Editorial Team·Last reviewed August 16, 2026·[Editorial policy](https://wellally.tech/editorial-policy)
## Key facts at a glance
LOINC21131-8Short codeCalcit 10M p 0.5 ug/kg Pg IV SerPl-mCncSynonymsCalcit 10M p 0.5 ug/kg Pg IV SerPl-mCncCategoryliverSampleserumContainerRed-top tube (SST)UnitsN/AFastingfalsePopulationadultSexallAge range18–65 yearsSpecimen volume5 mLStabilityRoom temperature: 4h, Refrigerated: 24h, Frozen: 7dHemolysis max500Lipemia max1000Icterus max500TAT4–24 hoursOrderroutine
## What is this test?


This test measures the concentration of calcitonin, a hormone made by thyroid C cells, in your blood. The sample is collected at a specified time after an intravenous dose, so the result reflects your response to stimulation.


## Why might I need this test?


Calcitonin testing may be used to evaluate thyroid C-cell disorders, including medullary thyroid cancer and its precursors. Your clinician may also use it when other thyroid findings or family history raise concern.


## How is the test performed?


A clinician gives the prescribed intravenous dose, and blood is collected exactly 10 minutes afterward for measurement. The dose and collection time are important because this is a timed stimulation test.


## How do I prepare for the test?


Follow your care team's instructions about fasting, medications, and the testing location. Because timing and the administered agent are essential, confirm the preparation plan and whether you will need to remain at the clinic for the timed blood draw.


## Clinical interpretation


How abnormal results are interpreted and what conditions they suggest.


Elevated calcitonin can result from increased thyroid C-cell activity, including medullary thyroid cancer or its precursors, and may also occur during stimulation. Other thyroid conditions and certain medications can affect results. Your clinician should interpret the value using the test timing, symptoms, imaging, and other thyroid tests.


## Short name


Timed Calcitonin Test


## Frequently asked questions
What does calcitonin measure?Calcitonin is a hormone produced by specialized thyroid C cells. Its level can help clinicians evaluate disorders involving these cells.Why is the blood sample collected at a specific time?The result measures how your calcitonin level responds after stimulation. A delayed or incorrectly timed draw could make the result difficult to interpret.Do I need to fast for this test?Follow the instructions provided by your care team or testing center, and do not fast unless specifically requested. The medication, dose, and exact blood-draw time should be confirmed before testing.
## Sources
3
1. 1MedlinePlus — Laboratory TestsSource
2. 2Lab Tests OnlineSource
3. 3Mayo Clinic — Tests & ProceduresSource


Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.


This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

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Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy