Thyroglobulin (serum/plasma concentration)
This test measures the amount of thyroglobulin, a protein produced by the thyroid gland, in your blood. It’s often used to monitor thyroid cancer treatment or check for recurrence.
["Thyroglobulin helps track thyroid health, especially after cancer treatment."]
Key facts at a glance
- LOINC
- 14918-7
- Short code
- Thyroglob SerPl-sCnc
- Synonyms
- Thyroglob SerPl-sCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why Is This Test Done?
Doctors may order a thyroglobulin test if you have thyroid cancer (such as papillary or follicular thyroid cancer), have undergone treatment like surgery or radioactive iodine therapy, or have symptoms like unexplained weight changes, fatigue, or a lump in your neck. It can also help detect early signs of thyroid cancer recurrence or monitor thyroid function after treatment.
What Does the Test Involve?
A blood sample is taken from a vein in your arm. The sample is sent to a lab where it’s analyzed to measure thyroglobulin levels. Results are compared to a reference range specific to your situation (e.g., post-treatment vs. baseline).
What Do Results Mean?
Thyroglobulin levels can vary widely depending on your medical history. Low levels may indicate successful treatment or normal thyroid function, while elevated levels (especially after treatment) could signal cancer recurrence. Your doctor will interpret results in the context of your overall health and treatment plan.
What Are Common Causes of Abnormal Results?
Elevated thyroglobulin can occur due to thyroid cancer, thyroiditis (inflammation), or certain autoimmune conditions. Low levels may reflect normal thyroid function or thyroid suppression (e.g., from medication). Other factors like pregnancy or thyroid hormone imbalances can also affect results.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Thyroglobulin is primarily used in thyroid cancer management to monitor treatment response and detect recurrence. It’s less common for diagnosing new thyroid cancer but is critical in follow-up care after treatment. Your doctor will guide its role in your care plan.
Short name
Thyroglobulin
Frequently asked questions
What does a ‘normal’ thyroglobulin result mean for me?
Can lifestyle factors (like diet or exercise) affect thyroglobulin levels?
How often will I need this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy