Fresh blood (unfixed) hematology control
First Claim
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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Accused Products
Abstract
Hematologic control and calibration standards are disclosed which are essentially plasma-free. These controls are prepared by the suspension of red blood cells in an appropriate buffer containing a stabilization effective amount of disaccharides, and other optional ingredients. Control and calibration standards prepared in the foregoing manner are suitable in the control and calibration of hematology analyzers for the following parameters: white cell count, red cell count, hemoglobin, hematocrit and the common derived parameters (i.e., mean cell volume, mean cell hemoglobin and mean cell hemoglobin concentration). The addition of platelets to the foregoing suspensions is also contemplated to provide a control for platelet parameters.
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Citations
9 Claims
- 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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9. A fluid comprising a 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 8.0 and a stabilizer consisting essentially of about 5 about 50 grams of a disaccharide per liter of buffered medium, the concentration of disaccharide and sodium ions relative to other unspecified components of this fluid being adjusted so as to (i) maintain the osmolality of the fluid in a range of from about 240 to about 340 mos/kg and (ii) to preserve the native ionic concentration within the red blood cells, thereby an osmotic equilibrium across the red blood cell membrane is achieved whereby minimizing an ionic transport across the red blood cell membrane, the pH of the fluid being maintained with the above range by a buffer selected from a group consisting of potassium phosphate and Good'"'"'s buffers.
Specification