What is the normal range for Calcitonin?

The normal range for Calcitonin is typically < 10 pg/mL pg/mL. Ranges may vary slightly by laboratory.

What does high Calcitonin mean?

Significantly elevated levels (>100 pg/mL) are highly suspicious for Medullary Thyroid Carcinoma. Mild elevations (10-100 pg/mL) may indicate C-cell hyperplasia, renal failure, or the use of certain medications and require further investigation.

What does low Calcitonin mean?

Low levels are typically normal and not associated with any specific disease state, as calcitonin is not essential for human health.

EndocrinologyOncology

Calcitonin

Q: What does high Calcitonin mean?

Significantly elevated levels (>100 pg/mL) are highly suspicious for Medullary Thyroid Carcinoma. Mild elevations (10-100 pg/mL) may indicate C-cell hyperplasia, renal failure, or the use of certain medications and require further investigation.

Normal Range

< 10 pg/mL

Sample Type: Serum
Fasting: Required
Unit: pg/mL

Function

Calcitonin is a 32-amino acid hormone produced by the parafollicular cells (also known as C-cells) of the thyroid gland. Its primary physiological role is to assist in calcium homeostasis by inhibiting bone resorption (the breakdown of bone) and increasing calcium excretion by the kidneys, effectively lowering blood calcium levels. However, in humans, its role in daily calcium regulation is minor compared to Parathyroid Hormone (PTH).

Why it is Ordered

In clinical practice, Calcitonin serves as a highly specific tumor marker. It is primarily ordered to diagnose Medullary Thyroid Carcinoma (MTC), a specific type of thyroid cancer that originates from the C-cells. It is also used to screen family members of patients with Multiple Endocrine Neoplasia type 2 (MEN2), a genetic syndrome that predisposes individuals to MTC. Post-operatively, it is used to monitor for cancer recurrence or the presence of residual disease.

Associated Conditions

Medullary Thyroid Carcinoma (MTC): Characterized by significantly elevated calcitonin.
C-cell Hyperplasia: A precursor state to MTC, often found in familial cases.
Chronic Renal Failure: Can cause secondary elevations due to decreased clearance.
Hypergastrinemia: Conditions like Zollinger-Ellison syndrome can stimulate C-cells to produce more calcitonin.

Due to its specificity for C-cells, calcitonin is one of the most reliable markers in thyroid oncology for this specific subset of cancers.

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Why Context Matters

Calcitonin levels can be falsely elevated by several factors, necessitating careful interpretation. The use of Proton Pump Inhibitors (PPIs) for acid reflux, chronic kidney disease, and even smoking can cause mild elevations. Furthermore, 'heterophilic antibodies' in a patient's blood can interfere with the lab assay, leading to a falsely high result. If an unexplained elevation is found, a second opinion often involves a 'calcium stimulation test' to confirm the diagnosis.

Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.

Clinical References

Source-of-truth databases and clinical guidelines for Calcitonin:

Official Sources

Current Guidelines for Management of Medullary Thyroid Carcinoma - PMCpmc.ncbi.nlm.nih.gov
ATA Guidelines & Statementsthyroid.org
Revised American Thyroid Association Guidelines for the Management of Medullary Thyroid Carcinoma: The American Thyroid Association Guidelines Task Force on Medullary Thyroid Carcinoma - PMCpmc.ncbi.nlm.nih.gov
The 2024 revised clinical guidelines on the management of thyroid tumors by the Japan Association of Endocrine Surgery - PMCpmc.ncbi.nlm.nih.gov
Revised American Thyroid Association guidelines for the management of medullary thyroid carcinoma - PubMedpubmed.ncbi.nlm.nih.gov

Research & Guidelines

PubMed: Calcitonin Clinical GuidelinesNCBI / PubMed

Related Indicators

Medically Reviewed by Dr. Binoy Babu, MBBS

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Why Context Matters

Clinical References

Official Sources

Research & Guidelines

Related Indicators

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Medically Reviewed by Dr. Binoy Babu, MBBS