ASTM E787-81 (Reapproved 2017)

Designation E787 81 Reapproved 2017Standard Specification forDisposable Glass Micro Blood Collection Pipets1This standard is issued under the fixed designation E787; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 This specification covers two dimensionally differentdisposable glass micropipets used primarily to collect wholehuman blood specimens for clinical analysis and testing. Theyare available as coated with heparin or uncoated.2. Referenced Documents2.1 ASTM Standards2E438 Specification for Glasses in Laboratory Apparatus3. Terminology3.1 Definitions of Terms Specific to This Standard3.1.1 disposable micropipetsin accordance with thisspecification and the expected product perance expressedin this standard, those pipets which are to be used one timeonly. Any institution or individual who reuses a disposablepipet must bear full responsibility for its safety and effective-ness.4. Classification4.1 This specification covers two dimensionally differentdisposable glass pipets as follows4.1.1 Short PipetApproximately 75 mm long and coatedwith heparin Type I or uncoated Type II. These arecommercially recognized as Caraway pipets.34.1.2 Long PipetApproximately 150 mm long and coatedwith heparin Type I or uncoated Type II. These arecommercially recognized as Natelson pipets.45. Materials and Manufacture5.1 GlassThe pipets shall be fabricated from borosilicateglass, Type I, Class B, or soda lime glass, Type II, inaccordance with Specification E438.5.2 Heparinshall be the ammonium salt isolated from thelungs or intestinal mucosa of beef or pork origin. The heparinpotency shall be 1 mg of ammonium heparin compound whichis equal to at least 100 USP units.56. Physical Requirements6.1 DesignThe disposable glass micro blood collectionpipets, both short and long, shall be straight and pulled to atapered point at one end. Any cross section of the pipets, takenin a plane perpendicular to the longitudinal axis, shall becircular. The pipets shall be lightly firepolished at both endswith no run-in and possess color bands to denote presence orabsence of heparin content.6.2 Dimensions6.2.1 The short Caraway pipet shall be approximately 75mm long and 4 mm in outside diameter. The pipet shall hold aliquid volume of 310 to 470 L. The tapered point length andtip orifice opening shall be as specified in Fig. 1.6.2.2 The long Natelson pipet shall be approximately 150mm long and 3 mm in outside diameter. The pipet shall hold aliquid volume of 220 to 420 L. The tapered point length andtip orifice opening shall be as specified in Fig. 2.6.3 WorkmanshipThe pipets, as illustrated in Fig. 1 andFig. 2, shall be free of defects that noticeably detract from theirappearance or impair their serviceability. They shall be free oflint, or significant foreign matter, loose or embedded whenviewed under normal room lighting. The top and tip ends of thepipets shall be cut at approximately 90 to the pipet axis andshall not be cracked or have jagged ends or chips that enter thebore of the pipet.6.4 Color CodingEach disposable glass micro blood col-lection pipet shall be color-coded to identify the pipet. Theheparin-coated pipet Type 1 shall have a red color band. The1This specification is under the jurisdiction of ASTM Committee E41 onLaboratory Apparatus and is the direct responsibility of Subcommittee E41.01 onLaboratory Ware and Supplies.Current edition approved Jan. 1, 2017. Published February 2017. Originallyapproved in 1981. Last previous edition approved in 2011 as E787 81 2011.DOI 10.1520/E0787-81R17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume ination, refer to the standards Document Summary page onthe ASTM website.3Caraway, W. T., and Fanger, H., “Ultramicro Procedures In ClinicalChemistry,” American Journal of Clinical Pathology , 25, 1955, pp. 316331.4Natelson, S., Ph.D., Micro-Techniques of Clinical Chemistry, Charles C.Thomas, Springfield, Ill., 1961, p. 70.5The United States Pharmacopeia, 19th Revision, pp. 229230.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade TBT Committee.1uncoated pipet Type 2 shall have a blue color band. Thelocation of these color bands shall be as specified in Fig. 1 andFig. 2.6.5 CapillaryThe pipets, both short and long, shall becapable of drawing sheep plasma or human whole blood thefull length of the pipet when tested as specified in 7.1.6.6 Fluidity Type 1, Heparinized, onlyCoagulation ofthe sheep plasma or human whole blood shall not be evidentwhen viewed under normal room lighting and tested asspecified in 7.2.6.7 Lot or Control NumberA lot or control number shallbe indicated on the intermediate and outer package of pipets.This lot or control number shall be traceable to the origin rawmaterial glass and heparin purchases of the manufacturingrecord.6.8 Resistance to Centrifugal Forces The pipets, bothshort and long, may be subject to centrifugal force undernormal analysis or test procedures. No breakage shall resultwhen tested as specified in 7.3.6.9 Heparin Coating Type 1, Heparinized, onlyTheinner surface of the short and long pipets shall be evenly coatedwith ammonium heparin. A minimum of 5.0 units of heparinactivity shall be present in the tube when tested as specified in6.4. A statement on expected units of heparin and an expirationdate may be claimed by the manufacturer. This option may beexpressed on the pipet package label.7. Test s7.1 Capillarity TestTest the pipets, both short and long,for capillarity when held at a near horizontal level. The pipetsshall fill with sheep plasma or human whole blood within amaximum of 30 s.7.1.1 When using a sealant or plastic closure, the pipetsshould not be filled completely to allow for dry space whichwill be occupied by the sealant or closure. This step should aidin preventing pipet leakage when handled or centrifuged.7.2 Fluidity TestTest the pipets, both short and long, forfluidity by using sheep plasma 6.3 or human whole blood6.4.7.3 Sheep Plasma Test7.3.1 GeneralConduct the test initially by preparing re-calcified sheep plasma by the following process7.3.1.1 Prepare sheep plasma in accordance with the USPassay for sodium heparin.Add 10 mLof prepared sheep plasmato 2.0 mL of the 1.0 calcium chloride solution used in theheparin assay. Mix the sheep plasma and calcium chloridesolution well.7.3.2 Preparation of ControlsUse samples of both theplain sheep plasma and recalcified sheep plasma as controls inaccordance with the following7.3.2.1 Positive ControlFill an uncoated that is, nonhepa-rinized pipet with recalcified sheep plasma.7.3.2.2 Negative ControlFill a coated that is, heparin-ized pipet with plain sheep plasma.7.3.3 ProcedureImmediately after the preparation of re-calcified sheep plasma, fill the pipets by immersing the tips inthe recalcified sheep plasma while holding the pipets near thehorizontal level to facilitate quick filling. Rock the pipetseveral times to assure intimate mixing of plasma with heparinon inner surface of capillary tube. Place the pipets in ahorizontal position. At the end of 1 h, inspect the pipetscontaining plasma for evidence of coagulation by carefullyscoring and snapping off segments of tubing and placing themon a flat surface. Use a black background to facilitateobservation and comparison with control sample. Coagulationhas occurred if the sheep plasma becomes opaque or if a finefibrin thread is noted.7.4 Human Whole Blood Test7.4.1 GeneralHuman whole blood may be used instead ofsheep plasma by following the steps outlined as follows7.4.1.1 Fill the pipets with freshly drawn whole blood byimmersing the tips in the blood while holding the pipets nearthe horizontal level to facilitate quick filling.7.4.1.2 Fill the pipets to within 5 mm from the top color-coded end or to approximately 100 mm from the tip on thelonger Natelson pipet that may be so marked and place in ahorizontal position.7.4.1.3 At the end of 1 h, expell the blood by means of anaspirator and drain on a clean white tissue.7.4.1.4 Examine the expelled blood with the naked eyeunder normal room lighting macroscopically for the presenceof clotting. Coagulation has occurred if a clot of any size isnoted.7.4.2 ControlsThe testing laboratory shall use a knowndonor that does not have clotting mechanism deficiencies as acontrol. Use samples of whole blood as controls in accordancewith the following7.4.2.1 Positive ControlFill an uncoated that is, nonhepa-rinized pipet with human whole blood and run during the testto ensure the suitability of the specimens clot ation.Capacity 310 to 470 LCoding Red band-heparin-coated Type IBlue band-uncoated Type IIDimensions in millimetresA Overall length 7377B Outside diameter 3.904.20C Inside diameter 2.402.80D Inside tip diameter 0.701.50E Length of taper 612F Color band location 010FIG. 1 Caraway PipetE787 81 201727.4.2.2 Negative ControlFill a coated tube heparinizedfrom a group of known quality with human whole blood andrun during the test to ensure the suitability of the specimensclot ation from other than lack of heparin that is,improper technique or specimen handling.7.5 Resistance to Centrifugal Force TestFill the pipets,both long and short, with water, sheep plasma, or human wholeblood; then seal and suspend in a centrifuge. Accelerate thecentrifuge gradually to a speed of 1000 to 1250 RCF.Allow thecentrifuge to run at this speed for 10 min only; then shut off andallow to stop without using the brake.7.6 Heparin Content TestDetermine the heparin content inthe micro blood collection pipets by the for assayingsodium heparin specified in the latest edition of the UnitedStates Pharmacopeia USP, or other acceptable ologythat will correlate and provide equivalent test results. Theresults obtained shall represent the average heparin content onthe inner surfaces of the pipets tested. No heparin from theoutside of the pipets surface shall enter the test sample.8. Keywords8.1 blood; disposable; glass; heparin; micro; pipetASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 phone, 610-832-9555 fax, or serviceastm.org e-mail; or through the ASTM websitewww.astm.org. Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel 978 646-2600; http// 220 to 420 LCoding Red band-heparin-coated Type IBlue band-uncoated Type IIDimensions in millimetresA Overall length 145155B Outside diameter 2.803.10C Inside tip diameter 0.751.30D Length of taper 612E Color band location 010 topF Alternative location 100 1 from tipG Inside diameter 1.301.80FIG. 2 Natelson PipetE787 81 20173