The Study
Role of Serum Triiodothyronine-to-Thyroxine Ratio and Thyroid Colour Flow Doppler in Differentiation of Graves’ Disease from Destructive Thyroiditis
This study found that when people have Graves' disease, their thyroid often has more blood flow and a certain hormone ratio — and those things are usually different from people with another thyroid problem. But it didn't prove that those things cause the disease — it just noticed they often happen together.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
When your thyroid makes too much hormone, it could be due to Graves' disease (an autoimmune problem) or thyroiditis (inflammation). This study tested if a simple blood ratio and ultrasound blood flow measurement can tell them apart without expensive scans.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 544 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — this means doctors in places without expensive scans can use a cheap ultrasound and blood test to confidently diagnose Graves' disease and start the right treatment.
- 2If T3/T4 ratio is above 19.2 and thyroid artery blood flow is faster than 38 cm/s, it's almost always Graves' disease — 100% of patients with both markers had Graves'.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Indian Journal of Endocrinology and Metabolism
Year
2026
Authors
H. Nehara, Sanjay Saran, Narendra Dara, Shinjan Patra, Sachin Banthia, Balkishan Gupta
Related Content
Claims (6)
In adults newly diagnosed with an overactive thyroid, a blood test ratio of T3 to T4 above 19.2 correctly identifies Graves' disease in 95.2% of cases and correctly rules out destructive thyroiditis in 92.9% of cases.
In adults newly diagnosed with an overactive thyroid, a blood flow measurement above 38 cm/s in the inferior thyroid artery using ultrasound reliably distinguishes Graves' disease from destructive thyroiditis.
In adults with Graves' disease, higher levels of triiodothyronine in the blood are associated with faster blood flow in the inferior thyroid artery.
In adults newly diagnosed with thyrotoxicosis, a combination of a high T3-to-T4 blood ratio and fast blood flow in the thyroid artery correctly identifies Graves' disease in all cases within this group.
Adults with destructive thyroiditis have smaller thyroid glands on average than adults with Graves' disease, with measured volumes of 14.7 mL compared to 28.5 mL. This difference in size can help doctors distinguish between the two conditions when other tests are not available.
In Graves' disease, blood tests show higher than normal levels of thyroid hormones T3 and T4, and very low or undetectable levels of thyroid-stimulating hormone (TSH).
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.