Thyroglobulin (serum/plasma) with electrophoresis profile
This test measures thyroglobulin levels in your blood and analyzes their pattern using electrophoresis, often used to monitor thyroid cancer treatment.
["Helps track thyroid cancer treatment progress by checking protein levels and their movement through blood components."]
Key facts at a glance
- LOINC
- 103007-1
- Short code
- Timothy (rPhl p) 5 IgE RAST
- Synonyms
- Timothy (rPhl p) 5 IgE RAST
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 10
- Ref high
- 40
- Critical range
- — – 500 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- rast
- CPT
- 84484
- SNOMED
- 302774002
- 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 This Test Is Done
Your doctor may order this test if you have a history of thyroid cancer, especially after treatment like surgery or radioactive iodine therapy. It helps ensure the cancer hasn’t returned or spread. This test is also used in follow-up care to monitor long-term effects of treatment.
What to Expect Before the Test
No special preparation is usually needed. You may have a small needle inserted into your arm or hand to draw blood. If you’re on blood thinners, let your doctor know before the test.
What the Test Results Mean
Thyroglobulin levels can vary. Low levels may indicate successful treatment, while higher levels could signal recurrence or thyroid issues. The electrophoresis part helps identify abnormal protein patterns that might suggest cancer activity.
Common Causes of Abnormal Results
Elevated levels can occur if cancer has returned, thyroiditis (inflammation), or other thyroid disorders. Low levels might mean the body is producing less protein normally. Always discuss results with your healthcare provider.
Reference range
Adult: 10-40 U/LN/A
No special preparation required. Avoid fatty meals before the test if possible.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Thyroglobulin (Tg) profile
Frequently asked questions
What symptoms might this test help diagnose?
How often should I get this test?
Can diet or medications affect 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 17, 2026. · Read our editorial policy