Thyroid
Thyroglobulin
LOINC 3041-1 · ng/mL
Ranges
Reference range: ≤ 55 ng/mL
What it is
Thyroglobulin is a protein made only by the thyroid. It is mainly used to monitor people treated for thyroid cancer.
Why it matters
After thyroid cancer treatment, thyroglobulin acts as a marker that the cancer has not returned.
What high values can mean
A higher value, in someone treated for thyroid cancer, can suggest remaining or returning thyroid tissue and needs review.
What low values can mean
A lower or undetectable value after treatment is generally reassuring.
How to improve it
Thyroglobulin is a monitoring marker, not something changed by lifestyle.
Food & lifestyle
No diet changes thyroglobulin; follow-up testing is guided by your specialist.
Preparing for the test
A blood test; fasting is not required — follow your lab's instructions.
When to talk to a doctor
Thyroglobulin results are interpreted by your specialist within your treatment plan.
Related markers
Sources
- MedlinePlus (NIH)
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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