NHA Phlebotomy Practice Test

A term used to describe a blood sample in which the red blood cells have ruptured is: - Answer - Hemolyzed Which of the following Vacutainer tubes is routinely used for hematology testing? - Answer - Lavender No anticoagulants are found in which tube? - Answer - Plain Red Which type of tube should be used to collect blood specimens during a glucose tolerance test? - Answer - Gray What is the anticoagulant that prevents platelets from clumping and preserves the appearance of blood cells for microscopic preparation? - Answer - EDTA( Ethylenediamine tetraacetic acid) What is the name of the slant at the open end of a needle used for venipuncture? - Answer - Bevel What is the most commonly used needle size for an adult venipuncture? - Answer - 21 guage What is the most commonly used needle size for an infant and the elderly? - Answer - 23 guage How long should a tourniquet remain tied on a patient's arm? - Answer - No longer than 1 minute Without a clot activator, whole blood typically clots in how many minutes? - Answer - 30-60 min. Thixotropic gel, found in the SST Tiger top tube is characterized as being: - Answer - less dense than red blood cells but more dense than serum What is the proper order for collection of a blood specimen for hematology testing, serum chemistry testing, and coagulation studies? - Answer - Light blue, red, lavender What is the correct tube for a typical hematology test (CBC)? - Answer - Lavender What happens when you leave a tourniquet tied on a patient's arm for longer than the recommended time? - Answer - Hemoconcentration