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Diagnostic strategies for subclinical hypothyroidism
Shruti Mohanty1, W Amruthlal, G C Reddy
1Department of Biochemistry, Kamineni Institute of Medical Sciences, Narkatpally, Nalgonda District A.P. 508 254 India.
Indian Journal of Clinical Biochemistry : IJCB
|October 30, 2012
Summary
This study identifies laboratory strategies for diagnosing subclinical hypothyroidism in symptomatic patients. Elevated anti-thyroid peroxidase antibodies suggest an autoimmune cause for thyroid dysfunction.
Area of Science:
- Endocrinology
- Clinical Chemistry
- Immunology
Background:
- Subclinical hypothyroidism presents diagnostic challenges in symptomatic individuals with normal thyroid profiles.
- Understanding the etiology of subclinical hypothyroidism is crucial for predicting progression to overt disease.
Purpose of the Study:
- To outline laboratory diagnostic approaches for subclinical hypothyroidism in symptomatic patients.
- To investigate the prevalence and etiological factors of subclinical hypothyroidism.
Main Methods:
- Estimation of tri-iodothyronine (T3), thyroxine (T4), thyroid-stimulating hormone (TSH), and anti-thyroid peroxidase antibodies (anti-TPO).
- Analysis of fasting blood samples from 99 patients using electrochemiluminescence (ECLIA) on ELECSYS 1010 (Roche).
Main Results:
- 61% of patients exhibited subclinical hypothyroidism.
- Elevated anti-TPO levels were found in 74% of all subjects and 73% of those with subclinical hypothyroidism.
- A significant association between elevated anti-TPO and subclinical hypothyroidism was observed.
Conclusions:
- Subclinical hypothyroidism in symptomatic patients often has an autoimmune etiology, indicated by elevated anti-TPO levels.
- Patients with subclinical hypothyroidism and elevated anti-TPO antibodies face a higher risk of developing overt hypothyroidism.
- Laboratory diagnostic strategies should consider anti-TPO assessment in symptomatic individuals with potential thyroid dysfunction.
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