[The preparation of blood samples for the automatic measurement of erythrocyte size]

The following procedure is proposed: fixation for 12 h in low ionic strength solution (4 percent formaldehyde in 50 mM sodium phosphate buffer), drying of the suspension drop on the slide, gallocyanin staining. All red cells were contrast-stained without light central spot. The sizes of different red cell groups on the slide differed by less than 5 percent.