AB123 Posted September 22, 2019 Share Posted September 22, 2019 Currently our lab ignores +/-, 0.5, or weak positive results (depending what your technology classes them as) on titres, hence we only report the titre as the value that gives a minimum 1+ reaction. Is this usual practice? recently we are getting alot of +/- Anti-D's that are only giving very weak reactions in IAT but confirmed in the Enzyme, hence when titrated they dont meet the criteria to be classed as a even a "neat" so we report them as too weak to titre. Just wanted to check if this is standard practice as in my previous experience all titres were sent to reference lab and I never saw any report that wasn't at least a "neat" Thanks Link to comment Share on other sites More sharing options...
Malcolm Needs ☆ Posted September 22, 2019 Share Posted September 22, 2019 We always used the last tube/column in a cassette that gave a macroscopic reaction. We certainly used "too weak to titre". AB123, David Saikin and John C. Staley 3 Link to comment Share on other sites More sharing options...
Ward_X Posted September 26, 2019 Share Posted September 26, 2019 We don't ignore the "weaker" agglutinations -- we still record M reactions... however, the result of the titer is the last dilution that is graded >M (i.e. is graded 1+). We have a test result called "below titerable levels" for a titer that doesn't have reportable results similar to what you are describing. AB123 1 Link to comment Share on other sites More sharing options...
Dansket Posted September 27, 2019 Share Posted September 27, 2019 We use a titer value of 0 (zero) to indicate absence of agglutination or less than 1+ agglutination in any tube. AB123 1 Link to comment Share on other sites More sharing options...
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