Mistakes when determining group accessory of a blood and measure of their prevention

The mistakes arising when determining group accessory of a blood happen two labors.

Errors of the first sort arise in case the agglutination test isn't considered where it actually is or has to be.

It can occur:

1) when agglutination begins late or is poorly expressed at low activity of reagent, or that erythrocytes of the studied person possess weak specificity.

2) at excess of a blood if too larger drop is taken.

3) at high temperature (above +25o C) air, for example, in hot weather.

Errors of the second sort arise in case the agglutination test is considered where it isn't present or shouldn't be. It can occur:

1) when erythrocytes of an blood develop in "monetary columns" which with the naked eye can be taken for agglyutinate.

2) when the studied erythrocytes give a phenomenon auto-or panagglutinations, when using of the infected sample of a blood of the patient (it is taken in a dirty test tube).

3) when and Serums don't shake a plate with an admixture of erythrocytes.