OPTICAL STANDARDS FOR AUTOMATED BLOOD ANALYSIS INSTRUMENTS

摘要

A stable standard for electro-optical hematology measurements comprises an aqueous solution of a) formaldehyde in a concentration of from about 0.5% to about 7.4% weight/volume; b) a sugar or sugar alcohol in a concentration sufficient to adjust the refractive index of the optical standard to that of the sheath stream; c) at least one buffer to maintain the pH of the solution between about 5.5 and 8.0; and d) stained white blood cells in a concentration of from about 10,000 to about 35,000 cells per 40 mu l. c