###1: TIMO-THY IgG Antibodies, Qualitative (Thyroid Microsomal and Thyroglobulin Antibodies)
###3: This test checks a blood sample for IgG antibodies directed against thyroid proteins, including thyroid peroxidase/microsomal antigens and thyroglobulin. It can help identify autoimmune thyroid disease when interpreted with thyroid function tests.
["###4: A positive result supports autoimmune thyroid disease, but thyroid function tests are needed to determine whether the thyroid is overactive, underactive, or still functioning normally."]
Key facts at a glance
- LOINC
- 10953-8
- Short code
- Timothy IgG Qn
- Synonyms
- Timothy IgG Qn
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 82784
- 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
###5: What the test measures
###6: TIMO-THY is a qualitative thyroid autoantibody test. It looks for IgG antibodies associated with immune attacks on the thyroid rather than measuring thyroid hormone levels directly.
###7: Why it is performed
###8: The test may be ordered when symptoms or laboratory results suggest Hashimoto thyroiditis, Graves disease, or another autoimmune thyroid condition. It is also sometimes used during the evaluation of thyroid enlargement or unexplained thyroid test abnormalities.
###9: How results are reported
###10: A qualitative result is generally reported as positive or negative. A positive result means the expected antibodies were detected, while a negative result means they were not detected at the laboratory's testing threshold.
###11: Other tests involved
###11: Thyroid autoantibody results are interpreted alongside tests such as thyroid-stimulating hormone and free thyroxine. These tests show how the thyroid is functioning and help distinguish among different thyroid disorders.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
###13: Clinical significance: A positive TIMO-THY result indicates thyroid autoimmunity and may support a diagnosis of Hashimoto thyroiditis or Graves disease, particularly when compatible symptoms and thyroid function abnormalities are present. However, thyroid antibodies can occasionally be present without current thyroid dysfunction, so a positive result does not by itself prove active disease. A negative result reduces the likelihood of some common autoimmune thyroid disorders but does not completely exclude them.
Short name
###2: Thyroid IgG antibody test, qualitative
Frequently asked questions
###14: Does a positive result mean I definitely have a thyroid disorder?
###16: Can someone with autoimmune thyroid disease have a negative result?
###18: Does this test measure my thyroid hormone levels?
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