Which of the following should be collected first for tests including CBC, chemistry panel, lead, and a toxicology screen via capillary puncture?
Red top tube
Lavender top tube
Light blue top tube
Royal blue top tube
The Correct Answer is B
Choice A Reason:
The red top tube is typically used for serum determinations in chemistry, serology, and blood bank. It contains no additive or may contain a clot activator. The red top tube is not the first choice for capillary puncture order of draw because it is designed for tests that require serum and not whole blood.
Choice B Reason:
The lavender top tube is used for whole blood hematology determinations, as it contains EDTA as an anticoagulant. According to the order of draw for capillary punctures, the EDTA tube should be collected first to ensure adequate volume and accurate hematology test results. This makes the lavender top tube the correct choice for the first collection in this scenario.
Choice C Reason:
The light blue top tube contains sodium citrate and is used for coagulation tests. In venipuncture, it is drawn after the blood culture bottle and before other tubes to prevent contamination with additives from other tubes. However, for capillary punctures, it is not the first choice as hematology tests take precedence.
Choice D Reason:
The royal blue top tube is used for trace element, toxicology, and nutrient determinations². While it may be used for lead and toxicology screens mentioned in the question, it is not the first tube to be drawn in a capillary puncture sequence. The EDTA tube (lavender top) is drawn first to prevent clotting and ensure accurate CBC results.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A Reason:
Using only one patient identifier is not sufficient to ensure patient safety and accuracy in healthcare settings. It increases the risk of misidentification, which can lead to serious medical errors. Therefore, one identifier is not the standard practice for patient verification before a blood draw.
Choice B Reason:
While two identifiers are commonly used in many healthcare settings as a minimum requirement, they may not always provide enough differentiation, especially in larger facilities where patient names may be similar. Two identifiers are often the minimum standard, but they are not the most comprehensive approach.
Choice C Reason:
Three unique patient identifiers provide a more robust method for verifying a patient's identity, significantly reducing the likelihood of errors. According to the Clinical and Laboratory Standards Institute (CLSI), three identifiers are recommended to ensure the correct patient is being collected. This may include the patient's full name, date of birth, and medical record number or another unique identifier.
Choice D Reason:
While using four unique identifiers could further reduce the risk of patient misidentification, it is not typically required as the standard minimum. Three identifiers are generally considered adequate for most healthcare settings to ensure patient safety and proper identification.
Correct Answer is A
Explanation
Choice A reason:
Mechanical safety is a critical aspect of laboratory inspections, especially when focusing on equipment maintenance logs. These logs are essential for ensuring that all mechanical equipment is functioning correctly and safely. Regular maintenance and inspection can prevent mechanical failures that could lead to workplace accidents or compromise the integrity of experiments.
Choice B reason:
Chemical safety is undoubtedly important in a laboratory setting; however, it is not the primary focus when the inspection is centered on equipment maintenance logs. Chemical safety would involve the proper storage, handling, and disposal of chemicals, which is a separate concern from the mechanical functioning of equipment.
Choice C reason:
Radiation safety is another vital area in laboratories that work with radioactive materials. However, the maintenance logs for equipment would not typically be the main focus of radiation safety inspections. Instead, radiation safety inspections would concentrate on ensuring proper shielding, monitoring, and training are in place.
Choice D reason:
Electrical safety is also essential, but similar to chemical and radiation safety, it is not the primary focus when inspecting equipment maintenance logs. Electrical safety would involve checking for proper wiring, grounding, and protection against electrical hazards.
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