butlermom Posted December 30, 2014 Share Posted December 30, 2014 How do you report a titer result when it is all negative, even the 1:1 shows no reaction? The antibody screen was 1+ with anti-D identified, but it did not titer out. Is it correct to report: Titer <1? Link to comment Share on other sites More sharing options...
Malcolm Needs ☆ Posted December 31, 2014 Share Posted December 31, 2014 That is how we report such findings. Link to comment Share on other sites More sharing options...
Yanxia Posted January 2, 2015 Share Posted January 2, 2015 We report it as titer 0.5. Link to comment Share on other sites More sharing options...
Auntie-D Posted January 2, 2015 Share Posted January 2, 2015 I though Anti-D was quantification, not titre? Link to comment Share on other sites More sharing options...
Malcolm Needs ☆ Posted January 2, 2015 Share Posted January 2, 2015 No Autie-D. The quantification of anti-D (and anti-c) is largely only performed in the UK (although I think I'm correct in saying that it is also used to a certain extent in Eire, Australia, France, New Zealand and Scandinavia) and, as the machines are coming to the end of their useful life, we (the UK Blood Services) are looking at other ways of performing anti-D and anti-c estimation, which may or may not involve titration and/or the use of a FACS machine - nothing has been decided yet. Even when a decision is made, we then have to go through validation, change control, etc etc etc. Auntie-D 1 Link to comment Share on other sites More sharing options...
Eagle Eye Posted January 2, 2015 Share Posted January 2, 2015 How do you report a titer result when it is all negative, even the 1:1 shows no reaction? The antibody screen was 1+ with anti-D identified, but it did not titer out. Is it correct to report: Titer <1?too weak to titer.This can be more common with gel screening and tube titer. John C. Staley and CMCDCHI 2 Link to comment Share on other sites More sharing options...
CMCDCHI Posted January 6, 2015 Share Posted January 6, 2015 We also use "too weak to titer" Link to comment Share on other sites More sharing options...
Abdulhameed Al-Attas Posted January 6, 2015 Share Posted January 6, 2015 too weak to titer, I agree with Eagle Eye. Link to comment Share on other sites More sharing options...
ANORRIS Posted January 6, 2015 Share Posted January 6, 2015 I report as < 1:1 Link to comment Share on other sites More sharing options...
Liz0316 Posted January 11, 2015 Share Posted January 11, 2015 we report as titer <1 Link to comment Share on other sites More sharing options...
Abdulhameed Al-Attas Posted January 13, 2015 Share Posted January 13, 2015 I report as < 1:1Anorris, I am afraid your report looks like a dilution rather than a titer. Eagle Eye and Malcolm Needs 2 Link to comment Share on other sites More sharing options...
goodchild Posted January 13, 2015 Share Posted January 13, 2015 too weak to titer.This can be more common with gel screening and tube titer. We've seen this occasionally with ProVue vs manual gel. Link to comment Share on other sites More sharing options...
StevenB Posted March 19, 2015 Share Posted March 19, 2015 Pet peeve topic.... There is no such thing as a titer of "less than one". It either meets the reaction criteria (generally 1+ is the standard, but other strengths might be in use) or it doesn't. The first tube in a standard titration contains nothing but raw sample and cells...so I'm not sure how you would treat the raw sample to obtain a titer of "less than one". A sample that has a +w reaction in tube one should be reported out as a titer of 0 if your standard for interpreting a titer result is higher than the +w reaction observed. Ok....I feel better now. Link to comment Share on other sites More sharing options...
Yanxia Posted March 20, 2015 Share Posted March 20, 2015 I remember when I was a student, one of my classmate report tube one no reaction with titer of less than zero, my teacher said you owe it some antibodies. Just one of many interesting in study. I don't think report titer O.5 is wrong, because some patient they have 2 drop serum and 1 drop cells tube reaction ,some not. To differ this I will report 0.5. Link to comment Share on other sites More sharing options...
galvania Posted March 20, 2015 Share Posted March 20, 2015 I don't understand how, if you use the same technique for your antibody screen and your titre you can get a 1+ result in the antibody screen and negative in the titre - unless you are using a very different cell pheno. I also don't understand why anyone would want to titrate an anti-D with a 1+ reaction. What is the reasoning behind this?Confused! Link to comment Share on other sites More sharing options...
Dr. Pepper Posted March 20, 2015 Share Posted March 20, 2015 Anna, I think many places use a more sensitive technique for the screen (LISS, PEG, gel etc) than the titer. Link to comment Share on other sites More sharing options...
galvania Posted March 20, 2015 Share Posted March 20, 2015 Ok - so that would explain the difference - I am a bit confused as to why you would do that, though - and I still don't understand WHY you would want to titrate such a weak anti-D Link to comment Share on other sites More sharing options...
Yanxia Posted March 20, 2015 Share Posted March 20, 2015 I don't understand how, if you use the same technique for your antibody screen and your titre you can get a 1+ result in the antibody screen and negative in the titre - unless you are using a very different cell pheno. I also don't understand why anyone would want to titrate an anti-D with a 1+ reaction. What is the reasoning behind this?Confused! I don't know how to do tube one of titer in your lab, in China, we will use one drop of serum/plasma and one drop of suspended cells as tube one or we call it titer 1.Antibodies screening and panels we use 2 drops of serum/plasma and one drop of cells to do it. So in some case, antibodies screening /panel is pos ,and antibodies titer is below 1. To report it as titer 0.5 is not about clinical significance, just to differ from some case panel is neg . Link to comment Share on other sites More sharing options...
Yanxia Posted March 20, 2015 Share Posted March 20, 2015 If we say its clinical significance, maybe about the appearance timing of this antibody. Link to comment Share on other sites More sharing options...
BloodBankGuy Posted April 9, 2015 Share Posted April 9, 2015 We use "Titer too low to measure: Enhancment reagents used for antibody identification are not recommended for titers." We do not enhance our titers as we do antibody identifications to prevent falsly high titers. We treat it as in vivo where we see how it demonstrates without the addition of enhancment reagents. dragonlady97213 and L106 2 Link to comment Share on other sites More sharing options...
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