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Fresh blood (unfixed) hematology control

  • US 4,489,162 A
  • Filed: 12/21/1981
  • Issued: 12/18/1984
  • Est. Priority Date: 12/21/1981
  • Status: Expired due to Fees
First Claim
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1. A fluid comprising an essentially plasma and nutrient free hematologic control and calibration standard having a predetermined amount of washed and unfixed red blood cells in a low sodium buffered medium, a pH range of about 6.8 to about 8 and a stabilizer consisting essentially of about 5 to about 50 grams of a disaccharide per liter of buffered medium, the concentration of disaccharide and sodium ions relative to other unspecified components of the fluid being adjusted so as to (i) maintain the osmolality of the fluid in the range of from about 240 to about 310 mos/kg and (ii) preserve the native ionic concentration within the red blood cells, whereby an osmotic equilibrium across the red blood cell membrane is achieved thereby minimizing ionic transport across the red blood cell membrane.

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