Which of the following criteria is acceptable in determining the quality of a peripheral blood smear?
Covers a quarter of the slide
A well-defined edge
Covers the entire slide
A feathered edge
The Correct Answer is D
Choice A reason:
Covering a quarter of the slide is not an acceptable criterion for the quality of a peripheral blood smear. The smear should be spread across the slide in a manner that allows for proper examination under a microscope, and covering only a quarter of the slide would not provide enough area for an adequate assessment.
Choice B reason:
Having a well-defined edge is not specifically indicative of the quality of a peripheral blood smear. While the edges should be clean to allow for clear viewing of the cells at the margins, the quality is more accurately determined by the distribution and integrity of the cells on the slide.
Choice C reason:
Covering the entire slide is also not a criterion for a quality peripheral blood smear. In fact, if the blood covers the entire slide, it may be too thick to allow for proper cell differentiation and examination. A proper smear should have a gradient of cell distribution, ending with a feathered edge.
Choice D reason:
A feathered edge is the correct criterion for a quality peripheral blood smear. The feathered edge is the thinnest part of the smear and is where the cells are ideally distributed in a single layer, which is optimal for microscopic examination. This allows for the best visualization of cell morphology and is essential for accurate diagnosis.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A Reason:
Prepping the site with povidone iodine is not typically associated with hemoconcentration. Povidone iodine is used as an antiseptic to clean the skin before venipuncture to prevent infection. While it's important to allow it to dry to avoid sample contamination, it does not cause hemoconcentration.
Choice B Reason:
Leaving the tourniquet in place for more than 2 minutes can lead to hemoconcentration. A tourniquet is applied to engorge the veins, making them easier to puncture. However, prolonged application can result in fluid being forced out of the vein into the tissue, increasing the concentration of cells and larger molecules in the blood. This can affect certain laboratory test results by artificially increasing the levels of cellular components.
Choice C Reason:
Not refrigerating the specimen within 30 minutes does not cause hemoconcentration. However, it can affect the stability of certain analytes in the blood sample. Refrigeration is necessary for preserving the integrity of certain components of the blood until analysis, but it is unrelated to the concentration of cells within the sample at the time of collection.
Choice D Reason:
Removing the needle before the tourniquet is released does not cause hemoconcentration. This action might lead to other complications, such as hematoma formation, but it does not affect the concentration of cellular elements in the collected sample.
Correct Answer is B
Explanation
Choice A Reason:
While informing the patient of the procedure is important, it is not the immediate next step after greeting. The technician should first ensure the patient's safety and comfort before proceeding with the details of the blood draw.
Choice B Reason:
Asking if the patient has a latex allergy is crucial as it directly pertains to patient safety. Many medical supplies, including gloves and tourniquets used during phlebotomy, may contain latex, which can cause allergic reactions in sensitive individuals. Identifying an allergy before any contact ensures that the technician can take necessary precautions to prevent an allergic reaction.
Choice C Reason:
Stating the technician's name to the patient helps build rapport but is not as critical as ensuring the patient's safety. It is a part of good communication and patient care practices but should follow after confirming any potential allergies or other immediate health concerns.
Choice D Reason:
Asking the patient which arm they prefer for the blood draw is a part of the procedure that involves patient preference and comfort. However, this should come after ensuring there are no allergies that could lead to complications during the draw.
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