Quantitative Thyroglobulin (without Thyroglobulin Antibodies) Test
This test measures thyroglobulin (TG) in a serum sample. Quest describes it as used mainly to monitor, not diagnose, people with well-differentiated thyroid cancer, and it can be ordered through Celio Health.
About this test
Thyroglobulin is produced only by the thyroid gland, so its concentration in blood reflects thyroid tissue activity or presence. A 1 mL serum sample is analyzed using immunoassay methods that measure the amount of thyroglobulin present. Quest also lists this test under the alias Thyroglobulin.
Quest describes the main use of this test as monitoring, not diagnosing, people with well-differentiated thyroid cancer: after thyroid removal and ablation, it may help determine whether metastasis is present. Quest also notes that deficient TG synthesis has been observed in infants with goitrous hypothyroidism.
Test details
| Quest code | 15561 |
|---|---|
| Methodology | Immunoassay |
| Sample type | 1 mL serum |
| Collection | Quest patient service center |
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Quest resources
Additional details
What this test looks at
The test reports one value: thyroglobulin concentration in serum. Because thyroglobulin is made only by the thyroid gland, Quest describes it as reflecting thyroid tissue activity, which is why it is used to monitor people after thyroid removal and ablation for well-differentiated thyroid cancer, to help determine whether metastasis is present.
Order online and a physician order is included — no doctor's visit and no insurance needed. Your sample is collected at a Quest Diagnostics patient service center.
Laboratory results should always be interpreted by a licensed clinician who knows your health history. This page is information about a test, not medical advice.
Frequently asked questions
What does this test measure?
It measures the level of thyroglobulin (TG) in a serum sample, using immunoassay methods.
How is the sample collected?
The test uses a 1 mL serum sample from a routine blood draw.
Do I need to prepare for this test?
No preparation instructions are listed for this test, though people follow any instructions their ordering clinician provides.
Is this test used to diagnose thyroid cancer?
Quest describes it as used to monitor, not diagnose, people with well-differentiated thyroid cancer, so it is used for monitoring or screening, not diagnosis on its own.
Why doesn't this version include thyroglobulin antibodies?
Quest notes that in immunometric assays, thyroglobulin antibodies can interfere and produce inappropriately low thyroglobulin results, which is why this test is reported without that antibody measurement.
How much is a Thyroglobulin Quantitative without Thyroglobulin Antibodies test?
$75, paid once at checkout. The price includes the physician's order this test requires and sample collection at a Quest patient service center.