Differential lymphoid-myeloid determination of leukocytes in whole blood
First Claim
1. A lytic diluent comprising a mixture of ingredients (A) and (B) where(A) is an aqueous saline solution of at least one quaternary ammonium salt having surface active properties, and(B) is at least one additive selected from the group consisting of(1) a short chain alkanol substituted by phenyl or phenoxy;
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said lytic diluent being buffered to an acid pH within the range of 3.5 to 5.0, and each of said ingredients (A) and (B) being present in an amount sufficient to bring about rapid and complete lysing of the red cells in whole blood for making a differential determination of lymphoid and myeloid populations of leukocytes, and also for measuring hemoglobin by chromagen formation.
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Abstract
This invention relates to a lytic diluent and a method for rapid lysing of red blood cells in whole blood for a differential determination of lymphoid and myeloid populations of leukocytes, and measurement of hemoglobin, particularly for use in automatic particle counting systems.
The diluent is a mixture of at least one quaternary ammonium salt having surface active properties, and an additive in suitable proportions, buffered to an acid pH of 3.5 to 5.0. The additive includes 2-phenoxyethanol and other short chain alkanols substituted by one phenyl or phenoxy, as well as certain polyhydroxy compounds.
When the reagent is employed in lower concentrations, an alkaline reagent comprising a quaternary ammonium salt and an alkali metal cyanide, buffered to an alkaline pH, may be added to complete the chromagen formation.
81 Citations
17 Claims
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1. A lytic diluent comprising a mixture of ingredients (A) and (B) where
(A) is an aqueous saline solution of at least one quaternary ammonium salt having surface active properties, and (B) is at least one additive selected from the group consisting of (1) a short chain alkanol substituted by phenyl or phenoxy; - and
(2) a polyhydroxy compound; said lytic diluent being buffered to an acid pH within the range of 3.5 to 5.0, and each of said ingredients (A) and (B) being present in an amount sufficient to bring about rapid and complete lysing of the red cells in whole blood for making a differential determination of lymphoid and myeloid populations of leukocytes, and also for measuring hemoglobin by chromagen formation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A lytic diluent comprising a mixture of ingredients (A) and (B) where
(A) is an aqueous saline solution of at least one quaternary ammonium salt having surface active properties, and (B) is at least one additive selected from the group consisting of (1) a short chain alkanol substituted by phenyl or phenoxy; - and
(2) a polyhydroxy compound; said lytic diluent being buffered to an acid pH within the range of 3.5 to 5.0, and each of said ingredients (A) and (B) being present in an amount sufficient to bring about rapid, but incomplete, lysing of the red cells in whole blood for making a differential determination of lymphoid and myeloid populations of leukocytes, and also for measuring hemoglobin for chromagen formation, wherein said chromagen formation is completed by the addition of an alkaline reagent comprising an aqueous solution of a quaternary ammonium salt and an alkali metal cyanide, the mixture being buffered with a basic buffer in sufficient concentration to allow rapid neutralization of said lytic diluent which is buffered to an acid pH. - View Dependent Claims (11, 12, 13)
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14. A method for the differential determination of lymphoid and myeloid populations of leukocytes and also for measuring hemoglobin by chromagen formation which comprises employing a diluent which is a mixture of ingredients (A) and (B) where
(A) is an aqueous saline solution of at least one quaternary ammonium salt having surface active properties, and (B) is at least one additive selected from the group consisting of (1) a short chain alkanol substituted by phenyl or phenoxy; - and
(2) a polyhydroxy compound; said lytic diluent being buffered to an acid pH within the range of 3.5 to 5.0; and
each of said ingredients (A) and (B) being present in an amount sufficient to bring about rapid and complete lysing of red cells in whole blood for making a differential determination of lymphoid and myeloid populations of leukocytes, and also for measuring hemoglobin by chromagen formation. - View Dependent Claims (15)
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16. A method for the differential determination of lymphoid and myeloid populations of leukocytes and also for measuring hemoglobin by chromagen formation which comprises employing a diluent which is a mixture of ingredients (A) and (B) where
(A) is an aqueous saline solution of at least one quaternary ammonium salt having surface active properties, and (B) is at least one additive selected from the group consisting of (1) a short chain alkanol substituted by phenyl or phenoxy; - and
(2) a polyhydroxy compound; said lytic diluent being buffered to an acid pH within the range of 3.5 to 5.0, and each of said ingredients (A) and (B) being present in an amount sufficient to bring about rapid, but incomplete, lysing of red cells in whole blood for making a differential determination of lymphoid and myeloid populations of leukocytes, and also for measuring hemoglobin by chromagen formation, wherein said chromagen formation is completed by the addition of an alkaline reagent comprising an aqueous solution of a quaternary ammonium salt and an alkali metal cyanide, the mixture being buffered with a basic buffer in sufficient concentration to allow rapid neutralization of said lytic diluent which is buffered to an acid pH. - View Dependent Claims (17)
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Specification