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different reference ranges for thyroid antibodies

From: KingGrand - 15 weeks 2 days ago

I have a question regarding the reference ranges of THYROGLOBULIN ANTIBODIES and THYROID PEROXIDASE ANTIBODIES.

A recent test of a one of my friend: THYROGLOBULIN ANTIBODIES 3 IU/mL reference range less than 1 IU/mL THYROID PEROXIDASE ANTIBODIES 19 IU/mL reference range less than 9 IU/mL I have found confliting info about the reference ranges for the two antibodies, for example, the following web sitehttp://emedicine.medscape.com/article/2086819-overview
shows the the reference ranges for the following two are 20 IU/mL ansd 35 IU/mL respectively.

Let me take THYROID PEROXIDASE ANTIBODIES as an example to ask the question: if the same blood sample is sent the same day to two labs with different reference ranges, one is 35 IU/mL, one is 9 IU/mL. 35 is about 4 times of 9, can I say that the result value of the THYROID PEROXIDASE antibody in the lab with range 35 should be roughly 4 times of the result value at the lab of reference range 9 ? For example, the result value of the antibody at the lab of reference range 9 IU/mL turns out to be 19 IU/mL, then the same blood sample tested in the lab with range 35 should be roughly 4 times of 19, which is about 76 IU/mL. That way, the ratio of the result value to the reference range will be roughly 2 for both labs, i.e. 19/9, 76/35 are both roughly 2.

Or, am I completely wrong? The result value at the two labs should be roughly the same, in the above mentioned example, both should be approximately 19 IU/mL? But then there is a problem for diagnosis, because one lab says it is within normal range, one says it is beyond normal range.

Any comments are appreciated.

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