Thyroid UK

Blood test on NDT

So I am taking 65mg (1 grain) of Nature-Throid each morning. I am due to have a blood test to check my thyroid function, and was wondering what is the best time of day to have this. If I have the test early in the morning, before taking my NT, it will have been 24 hours since my last dose. Is that too long? I know you should leave 24 hours with Levo, but don't know if the same rule applies with NDT. I am using a private test, Medichecks, so I want to get it right!

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Anything witht3 in it, like NDT, it should be 8-12 hours maximum since last dose when you do blood tests. Not sure the best way to juggle it... I take my NDT at bedtime so just take an hour it so earlier the evening before test.

X Linda 🙂

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Thank you fibrolinda

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It is recommended to leave 24 hours between dose and test and take it afertwards (that's if you take a morning dose). If you take an evening dose, miss this and take after test and night dose as usual.

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Thank you for your reply shaws

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AiryFairie,

If you leave 24 hours between last dose and blood draw you can add +20% to your FT3 result to estimate the normal circulating level.

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Thank you Clutter

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