What is an anticoagulant that prevents platelets from clumping and preserves the appearance of blood cells for microscopic preparation?
A tourniquet is used during the phlebotomy procedure to
prevent venous flow out of the site and cause the vein to bulge
In performance of a microhematocrit:
the open end of the capillary tube should be sealed with clay before centrifuging
The copper sulfate method of determining the hemoblogin level is:
a qualitative test
based on the specific gravity of hemoglobin
commonly used to screen blood donors
The _____ is the part of the venipuncture needle that fits into the syringe or Vacutainer adapter.
You are required to collect a venous sample for a typical hematology test, the complete blood count. You collect:
a lavender-topped tube
In a routine venipuncture, the angle at which the needle enters the arm should be _______ degrees.
During a routine venipuncture, when should the phlebotomist request that the patient "make a fist"?
after applying the tourniquet and before inserting the needle
During the routine venipuncture, when should the phlebotomist request that the patient "release the fist"?
when the last tube has been filled, before the tourniquet is removed.
Which vein (s) can be used for routine venipuncture?
medial cephalic, medial basilic, supplementary cephalic
A hematoma can be caused by
excessive probing to locate a vein, failure to insert the needle far enough into the vein, penetration of the needle through a vein
Blood obtained via capillary puncture can be collected
in microtainer tubes, capillary tubes, microhematocrit tubes, and onto filter paper
Which is the most correct method for performing a capillary puncture?
wipe away the first drop of blood and then collect the sample
You are performing a capillary puncture on a patient and are having difficulty collecting an adequate sample. Which of the following is an accepted method to encourage blood flow from the site?
gently rub the finger along the sides
Which is the proper technique for performing a venipuncture?
the needle bevel is face up, and the needle is inserted at a 15-degree angle.
The smallest of the formed elements in the peripheral blood is a cell fragment that assists with clotting; it is known as a
platelet or thrombocyte
A counting chamber known as a _________ is used to enumerate blood cells in a diluted specimen.
The granular leukocytes, which are called ________ leukocytes, include neutrophils, eosinophils, and basophils.
A _______ is performed by the immunohematology department to determine blood compatibility before a transfusion
type and cross
If a blood sample has a decreased number of normal WBCs, the patient is diagnosed with
The ________ is the standard unit for reporting PT results; the other method is the time required, in seconds, for a clot to form in a blood specimen.
Fibrin creates a network of threadlike structures called _________ that begin clot formation.
The largest of the Vacutainer tubes typically used for phlebotomy fills to a volume of 10 mL. Approximately ________ tubes are needed to fill a pint (473 mL).
The typical site for a capillary puncture on an infant is the medial or lateral side of the ________.
________ are used for small veins, such as those in the hand or in a pediatric patient.
A _______ is a special laboratory filter paper that is used to collect a blood sample from newborns.
A ________is applied to the skin 30 to 60 seconds before the blood draw to prevent infection at the puncture site.
The liquid portion of blood that remains after the blood has clotted in a collection tube is the ________