The Study
Three basic patterns of changes in serum thyroid hormone levels in Graves’ disease during the one-year period after radioiodine therapy
This study watched how thyroid hormone levels changed in 58 people after they got a special treatment, and found three common patterns. But it didn't test if the treatment caused those changes — it just saw what usually happened. So we can say 'this pattern often shows up,' but not 'this treatment causes that result.'
Analysis score
Maximum 72 for a cohort study.
Where the score came from
After radioactive iodine treatment for an overactive thyroid, hormone levels don't just drop—they go up and down in predictable patterns before settling.
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 527 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes—knowing these patterns helps doctors predict whether a patient will end up with normal, low, or high thyroid levels after treatment, guiding follow-up care.
- 277% of patients had a quick drop in hormones; 67% had a 'valley' pattern (drop, then rise); 17% had a 'mountain' (rise, then drop, then rise again); 16% had a slow 'downhill' drop.
- 3The lowest point predicted the final outcome in 86% of cases.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Annals of Nuclear Medicine
Year
2005
Authors
M. Nakajo, S. Tsuchimochi, H. Tanabe, Y. Nakabeppu, M. Jinguji
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Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.