Blood collection tube with surfactant
Improvements in blood collection and testing. In one aspect, an improved method of manufacturing a blood collection tube, particularly illustrated for use in sedimentation rate testing, including providing an elongated glass tube with an open first end for receiving a venipuncture blood sample of at least 1 ml, formed with a closed end opposite the first end; and applying to a substantial portion of the receptacle a containment barrier. The improvements also pertain to resulting blood collection tubes, additives for blood collection tubes that permit reliable sedimentation test data after 8 hours from the blood draw, and methods of administering health care using the aforenoted tubes, additives or both.
1. A kit for performing a blood sedimentation rate analysis, comprising:
a) a substantially optically clear glass tube having an overall length of about 100 to about 300 mm and a wall thickness of about 0.5 to about 1.5 mm, and having a plastic containment barrier that covers substantially the entirety of the outer surface of the tube with a thickness of less than about 1 mm and a closed end, and containing an additive including a polyoxyethylene lauryl ether surfactant that is free of clouding under the conditions to which it will be exposed prior to and during sedimentation rate testing and at least one additional additive selected from the group consisting of an anti-microbial, an anti-coagulant, a preservative, or any combination thereof, wherein the surfactant is present in the tube in sufficient amount that it is capable of providing reproducible sedimentation rate tests in a consistent and reproducible manner that approximates that of a fresh blood sample after a delay of more than about 6 hours; and
b) at least two components for performing a blood sedimentation rate analysis selected from the group consisting of an alcohol swab, gauze, a tube holder, a tube rack for performing a blood sedimentation rate analysis, a tourniquet, a glove, another cell collection tube, needle, lancet, adhesive strip, syringe, test strip, glass or plastic strip containing reagents for cell analysis, packaging to store any desired components, packaging to transport a blood sample stored in the tube after collection, a timer, a worksheet, or any combination thereof.
2. A blood collection tube for sedimentation rate analysis, comprising:
an evacuated elongated glass tube with an open first end for receiving a venipuncture blood sample of at least 1 ml, formed with a closed end opposite the first end;
a plastic containment barrier that is substantially transparent and substantially encapsulates the exterior surface of the elongated glass tube so that following a fracture of the tube, blood is contained within the tube;
and a polyoxyethylene lauryl ether surfactant, being present within the tube in sufficient amount that it is capable of providing a reproducible sedimentation rate test in a consistent and reproducible manner that approximates that of a fresh blood sample after a delay of more than about 6 hours, and that is free of clouding under the conditions to which it will be exposed prior to and during sedimentation rate testing.
3. The blood collection tube of claim 2 , wherein the surfactant is present in a concentration of about 0.1 g/l to about 5 g/l, the surfactant is selected to have an average monomer molecular weight in the range of about 500 to about 2000, and the surfactant will have an aggregation number that ranges from about 20 to about 120; and further comprising at least one additional additive placed within the tube selected from the group consisting of an anti-microbial, an anti-coagulant, a preservative, or any combination thereof.
4. The blood collection tube of claim 3 , wherein the surfactant is present such that a sedimentation rate test approximating that of fresh blood is obtained after a period of at least 4 days between the time of a blood draw and sedimentation rate testing.
5. A method for performing an erythrocyte sedimentation rate analysis, comprising:
drawing a venipuncture blood sample into an evacuated elongated glass tube with an open first end and a closed end opposite the first end, the elongated glass tube including a plastic containment barrier that is substantially transparent and substantially encapsulates the exterior surface of the elongated glass tube so that following a fracture of the tube, the blood sample is contained within the tube;
contacting the blood sample with a polyoxyethylene lauryl ether surfactant in the glass tube, the surfactant being free of clouding under the conditions to which it will be exposed prior to and during sedimentation rate testing and being present within the tube in a sufficient amount that it is capable of providing a reproducible sedimentation rate test in a consistent and reproducible manner that approximates that of a fresh blood sample after a delay of more than about 6 hours; and
performing the erythrocyte sedimentation rate analysis while the blood sample is contained within the tube.
6. The method of claim 5 , wherein the surfactant is a nonionic surfactant of the form C x E y , where C is an alkyl chain and E is a polyoxyethylene chain and where x is the number of carbons in the alkyl chain and y is the number of ethylene oxide units in the polyoxyethylene chain.
7. The method of claim 6 , wherein x is from about 6 to about 18 and y is from about 4 to about 40.
8. The method of claim 7 , wherein the surfactant is present in a concentration of about 0.1 g/l to about 5 g/l, the surfactant is selected to have an average monomer molecular weight in the range of about 500 to about 2000, and the surfactant will have an aggregation number that ranges from about 20 to about 120.
9. The method of claim 6 , further comprising contacting the blood sample in the tube with at least one additional additive placed in the tube selected from the group consisting of an anti-microbial, an anti-coagulant, a preservative, or any combination thereof.