No. Hormone tests are interpreted together with symptoms, medical history, and other laboratory results.
Information about a laboratory test
Thyroglobulin (Tg): What Does This Blood Test Measure?
Measures the blood level of thyroglobulin, a protein produced by thyroid cells.
Test summary
- Test name
- Thyroglobulin (Tg)
- Abbreviations
- Tg
- Category
- Endocrinology / Thyroid Oncology
- Panel
- Thyroid Tumor Marker Monitoring
- Specimen
- Serum / plasma
- Common units
- ng/mL, µg/L
What does the test measure?
Measures the blood level of thyroglobulin, a protein produced by thyroid cells.
Why is the test ordered?
Used mainly for follow-up after treatment of differentiated thyroid cancer; it is not a general thyroid screening test.
Information about a low result
Low or undetectable thyroglobulin depends on the amount of remaining thyroid tissue, prior treatment, TSH, and other context.
Information about a high result
High or rising thyroglobulin may warrant further evaluation in post-treatment follow-up; a single value is not diagnostic by itself.
Reference and clinical context
Use the reference interval printed on your own laboratory report first. Hormone results may vary with the assay, age, sex, pregnancy, menstrual-cycle phase, and sampling time.
Reference ranges may vary by laboratory, method used, age, sex, pregnancy status, and clinical context. The reference range on your own laboratory report takes precedence.
Interpretation notes
Anti-Tg antibodies can make thyroglobulin appear falsely low. The same assay and preferably the same laboratory improve trend comparability.
Related specialties
- Endocrinology
- Nuclear Medicine
- Medical Oncology
- General Surgery
Frequently asked questions
Sources
Thyroglobulin — U.S. National Library of Medicine (MedlinePlus)
Government medical reference · 2026 · Thyroglobulin follow-up after thyroid-cancer treatment; method and anti-Tg interference · Verified: Aug 11, 2026
Tanitedavi.com is a Biruni Teknopark project. BETA