A phlebotomist needs to collect a PT (Prothrombin Time) from a patient with a difficult vein. Which of the following is the best tube for the draw?
Light green
Lavender
Royal blue
Light blue
The Correct Answer is D
Choice A reason:
The light green tube typically contains lithium heparin and is used for plasma determinations in chemistry. It is not suitable for coagulation studies, such as PT, because heparin is an anticoagulant that would interfere with the test results.
Choice B reason:
The lavender tube contains EDTA, which is an anticoagulant that binds calcium. While it is commonly used for complete blood counts (CBC) and other hematology tests, it is not appropriate for coagulation studies because the binding of calcium would affect the clotting process required for a PT test.
Choice C reason:
The royal blue tube can come with different additives or be additive-free, depending on the color of the closure. It is primarily used for trace element testing, toxicology, and nutrient determinations. The additives in a royal blue tube could potentially contaminate the sample and interfere with the PT test.
Choice D reason:
The light blue tube contains sodium citrate, which is the appropriate anticoagulant for coagulation studies like PT. Sodium citrate works by binding calcium in the blood, preventing clotting. The PT test measures the time it takes for a clot to form after re-calcification, making the light blue tube the correct choice for this test.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A Reason:
A multipart requisition involves multiple copies of a paper form, which can be prone to errors due to manual entry, misplacement, or illegible handwriting. While it provides physical copies for various departments, it is not the most accurate method compared to digital solutions.
Choice B Reason:
A manual requisition is similar to a multipart requisition but typically consists of a single form. It carries the same risks of human error and does not offer the benefits of automated tracking and data entry that come with electronic systems.
Choice C Reason:
An automated requisition is considered the most accurate method for receiving orders for specimen collection. It reduces the risk of human error associated with manual data entry and allows for better tracking and integration with laboratory information systems. Automated systems can also provide immediate feedback if there is an issue with the order, such as a missing patient identifier or a test code.
Choice D Reason:
A verbal requisition is the least reliable method as it depends on the memory and communication skills of the individuals involved. It lacks the documentation and verification steps present in written or automated methods, making it susceptible to misunderstandings and errors.
Correct Answer is C
Explanation
Choice A reason:
Simply observing the site to see if the hematoma worsens is not an appropriate response. While monitoring the development of a hematoma is part of the process, it is not a proactive measure to address the immediate issue. The phlebotomist must take action to prevent further injury or complication.
Choice B reason:
Asking the patient to apply pressure may be part of the post-venipuncture care, especially after the needle has been removed, to aid in stopping any bleeding. However, this does not address the immediate concern of a developing hematoma during the draw.
Choice C reason:
Releasing the tourniquet and stopping the draw is the correct action to take when a hematoma is observed. This response is in line with the standard procedure for when a complication arises during venipuncture. Stopping the draw helps prevent further blood from pooling and exacerbating the hematoma.
Choice D reason:
While calling for a nurse and assessing the patient's condition is important, especially if the phlebotomist needs assistance or the patient shows signs of distress, it should not be the first action taken. The immediate response should be to address the hematoma by stopping the draw.
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