Which of the following information should the physician's office provide to a phlebotomist for laboratory specimen collection?
Laboratory accession number
Physician's NPI number
Laboratory requisition form
Physician's encounter form
The Correct Answer is C
Choice A reason:
The laboratory accession number is a unique identifier assigned to a patient's specimen once it is received by the laboratory. While it is an important piece of information, it is not provided by the physician's office to the phlebotomist for specimen collection. Instead, it is generated by the laboratory after the specimen is collected and submitted for analysis.
Choice B reason:
The Physician's NPI (National Provider Identifier) number is a unique identification number for covered health care providers in the United States. While it is used for billing and identification purposes, it is not the information that the physician's office needs to provide to a phlebotomist for the purpose of specimen collection.
Choice C reason:
The laboratory requisition form is the correct document that should be provided by the physician's office. This form contains the patient's demographic information, the tests ordered by the physician, special instructions for specimen collection, and any other pertinent information required for proper specimen handling and testing.
Choice D reason:
The physician's encounter form typically contains details of the patient's visit, including services provided, diagnoses, and billing information. It is not specifically used for laboratory specimen collection and therefore is not the information that should be provided to a phlebotomist for this purpose.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
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.
Correct Answer is B
Explanation
Choice A Reason:
Body temperature does not significantly affect serum cortisol levels and is not a factor that needs to be considered when planning to collect a cortisol specimen. Cortisol levels are regulated by the hypothalamic-pituitary-adrenal axis and not by body temperature.
Choice B Reason:
Time of day is a critical factor to consider when collecting a specimen for serum cortisol level measurement. Cortisol levels follow a diurnal pattern, peaking in the early morning hours and declining throughout the day, with the lowest levels typically occurring around midnight¹². This variation is known as the cortisol awakening response (CAR) and is important for accurately interpreting the results of the test.
Choice C Reason:
Alcohol consumption can affect cortisol levels; however, it is not typically a factor that a phlebotomist needs to consider immediately before specimen collection unless the patient is under the influence at the time of the test. Chronic alcohol use can lead to alterations in cortisol levels, but this is more of a consideration for the healthcare provider interpreting the results rather than the phlebotomist collecting the specimen.
Choice D Reason:
Prandial status, or the fed or fasting state of the patient, can influence cortisol levels, but it is not as significant a factor as the time of day. Cortisol levels can be slightly higher after eating, but this effect is generally considered minimal. The primary concern for prandial status would be if the cortisol test is being conducted alongside other tests that require fasting.
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