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Normal ranges for celiac antibody tests


RMJ

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RMJ Mentor

My celiac antibody tests have been ordered by doctors in the same Gastroenterology department in the same health system for 12 years.

The TTG-IgA test has had three different normal ranges in that time!

  • Original normal range 0-19 units
  • Next normal range 0-3 units
  • New normal range 0.00 to 4.99 FL units

The DGP tests have only had two different normal ranges, so for a period of time the TTG and DGP tests had different normal ranges.

  • Original range 0-19 units
  • New normal range 0.00 to 4.99 FL units

I don’t know what FL stands for. Perhaps fluorescent, as some tests use a detector that measures fluorescent tags. The units used for celiac antibody tests are not absolute weight per volume units like many blood tests.  They are set by each test manufacturer and standardized for their tests, which is fine and normal unless you’re trying to compare results from one time to another!

This is why I often respond to posts by asking for the standard ranges of the poster’s test results🙂.


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Scott Adams Grand Master

Thank you for sharing this! It is strange to see the changes in the reference ranges over that time period. 

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