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TSH/Free T4 with or without fasting?
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Thyroid medication has a slow-release and steady effect over time. However, for accurate TSH measurement, it's recommended to take the medication after the blood draw or at least 4-6 hours before the test to minimize potential interference with TSH levels.
Fasting status can influence TSH levels, but the effect is usually minimal. However, for consistency, healthcare professionals may recommend repeating tests under similar conditions, including fasting or non-fasting status, to ensure accurate comparisons.
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Fasting won’t affect the result but don’t miss the morning dose
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Skip medicines
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Hi. Thyroid profile is mandatory in fasting sampling.
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With fasting
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Dr Vinutha Nakul
Diabetologist
5 yrs exp
Bangalore
Skip meds before testing.
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Dr. Chandrakant Lahariya
Diabetologist
21 yrs exp
Delhi
The thyroid function test should be done soon after getting up. However, since most of t he labs start collecting samples at 7 am.
So, don’t take thyroid medicine or any food till yo it sample is collected.
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Dr. Ram Brahma Reddy
Diabetologist
4 yrs exp
Hyderabad
Don't miss doses
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Disclaimer : The content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding your medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.