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TSH value 4.466 µIU/m to 0.150 µIU/m
TSH value went from 4.466 µIU/m to 0.150 µIU/m in 2 months time without taking any kind of medications for Thyroid. Have been recently recovering from Viral Throat Infection. The first value came in a test in October end and today got the lower value. What can cause this huge difference? Can viral infections cause this? Can taking Antibiotics affect the TSH value this drastically?
We call this ‘Sick Euthyroid’.
Recheck TSH in 6 weeks time.
All the best.
J G S R clinic
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Transient fall in TSH can occur due to infection, inflammation.
Repeat test after 3 months.
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Yes, this kind of TSH fluctuation can happen and does not always mean permanent thyroid disease.
• A recent viral infection can cause subacute (viral) thyroiditis, where the thyroid temporarily releases stored hormones → this suppresses TSH (low TSH like 0.150).
• This condition often follows viral throat/URI infections and can evolve over weeks.
• Antibiotics themselves do NOT directly lower TSH. The timing is likely coincidental; the infection/inflammation is the real trigger.
• Lab variability, illness-related stress, and recovery phase can also affect TSH levels.
• The earlier TSH of 4.46 could represent transient subclinical hypothyroidism or early thyroiditis phase.
Next Steps
1. Repeat TSH + Free T4 + Free T3 after 4–6 weeks (when fully recovered).
2. If TSH remains low → check ESR/CRP and thyroid antibodies (TPO, TRAb).
3. Monitor symptoms: palpitations, weight loss, tremors, heat intolerance.
4. No thyroid medication unless symptoms are significant or labs stay abnormal.
Health Tips
• Avoid testing thyroid function during or immediately after infections.
• Do not start or stop thyroid medicines based on a single report.
• Most cases of viral thyroiditis are self-limiting and normalize in a few months.
Bottom line:
This change is most likely infection-related and temporary, not caused by antibiotics.
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