Understanding Calcitonin, Serum [ECLIA]: Normal vs Optimal Ranges
Also known as: serum calcitonin, ct, thyrocalcitonin
?What is Calcitonin, Serum [ECLIA]?
Calcitonin is a hormone produced by the parafollicular cells (C cells) of the thyroid gland that plays a key role in calcium homeostasis and bone metabolism. This test measures serum calcitonin levels using electrochemiluminescence immunoassay (ECLIA), a highly sensitive method. Elevated calcitonin may suggest medullary thyroid carcinoma, other neuroendocrine tumors, or certain metabolic conditions.
!Why It Matters
Calcitonin is a sensitive tumor marker for medullary thyroid carcinoma (MTC) and can aid in early detection and monitoring of this malignancy. Abnormal levels may suggest thyroid or neuroendocrine disease, calcium metabolism disorders, or other systemic conditions. Serial calcitonin measurements can help assess disease progression and treatment response in patients with known MTC.
Reference Ranges
| Range Type | Min | Max | Unit | Note |
|---|---|---|---|---|
| Lab Normal | 0 | 10 | pg/mL | Standard lab reference range |
| Optimal | — | 5 | pg/mL | Evidence-based optimal range for health |
| Longevity Target | — | 5 | pg/mL | Per longevity medicine research (Attia et al.) |
Lab normal ranges may vary between laboratories. Optimal and longevity targets are based on research literature and should be interpreted with your physician.
Symptoms of Imbalance
- Neck lump or mass
- Persistent cough or hoarseness
- Difficulty swallowing
- Bone pain or weakness
- Diarrhea or flushing (in advanced cases)
How to Improve Your Levels
- 1If elevated, work with an endocrinologist to investigate underlying thyroid or neuroendocrine pathology
- 2Maintain adequate calcium and vitamin D intake through diet or supplementation
- 3Avoid smoking and minimize alcohol consumption to support thyroid health
- 4Regular monitoring and follow-up testing if MTC or neuroendocrine disease is suspected
- 5Manage stress through relaxation techniques, as stress may influence hormone levels
- 6Ensure adequate protein intake to support overall endocrine function
When to Test
Calcitonin should be tested when medullary thyroid carcinoma is suspected (family history, thyroid nodule), during screening for multiple endocrine neoplasia (MEN) syndromes, or for surveillance and treatment monitoring in patients with known MTC. It may also be ordered when evaluating persistent hypercalcemia or unusual neuroendocrine symptoms.
Related Biomarkers
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