A multifunctional reagent for erythrocytes containing an amount sufficient to produce the lysis of erythrocytes or the sphering of erythrocytes in such a way that they can be detected by a cytometer or an automatic counting device, of a carbamate or of an agent inducing the formation by the erythrocytes, from carbonate and from a nitrogenated heterocycle or ammonium ions, of a carbamate combined with the absorption of CO.sub.2 by said erythrocytes, process for lysing or sphering erythrocytes and preparation process for leucocytes.

 
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> Control of uncertain angle of incidence of beam from Arc lamp

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