Blood collection tubes fill correctly during venipuncture due to which of the following factors?
The high pressure in the arterial system
The high pressure in the venous system
The positive pressure created by the tourniquet
The negative pressure within the tube
The Correct Answer is D
Choice A reason:
The high pressure in the arterial system is not a factor in the filling of blood collection tubes during venipuncture. Arterial blood is not typically collected using evacuated tubes; these are used for venous blood collection, where the pressure is lower.
Choice B reason:
While the venous system does have pressure that aids in blood flow, it is not the high pressure that causes blood collection tubes to fill. Venous pressure is relatively low compared to arterial pressure, and on its own, it is not sufficient to fill the vacuum tubes used in venipuncture.
Choice C reason:
The positive pressure created by the tourniquet can help engorge the veins, making them easier to access, but it does not directly cause the blood collection tubes to fill. The tourniquet's role is to assist in vein visualization and palpation rather than in the filling of the tube.
Choice D reason:
The negative pressure within the tube is the correct factor that causes blood collection tubes to fill during venipuncture. When the needle punctures the patient's vein and then the tube stopper, the vacuum in the tube pulls blood into it until the vacuum is exhausted or the tube is filled. This is why it is essential not to allow the tube contents to contact the stopper, as backflow into the venous system can cause adverse reactions.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A Reason:
Keeping the patient as upright as possible is not recommended in cases of shock. When a patient is in shock, it is important to lay them down and elevate their legs slightly, unless this position causes pain or further injury. This position helps improve blood flow to the brain.
Choice B Reason:
Providing a cooling blanket is not a standard first aid measure for shock due to a medication reaction. A cooling blanket may be used in cases of hyperthermia or heatstroke to reduce body temperature, but not typically for shock, which requires maintaining normal body temperature and preventing chilling.
Choice C Reason:
Administering oral fluids to a patient in shock is not advisable. During shock, a patient may have an impaired swallowing reflex or be unconscious, increasing the risk of aspiration. It is best to avoid giving anything by mouth until medical personnel arrive.
Choice D Reason:
Maintaining an open airway is crucial for a patient in shock. Ensuring that the airway is clear allows the patient to breathe effectively, which is essential for delivering oxygen to the tissues and organs. If the patient is unconscious or has an altered level of consciousness, the phlebotomist should check for breathing and begin CPR if necessary.
Correct Answer is B
Explanation
Choice A Reason:
Submitting laboratory results to the representative for workers' compensation is generally not a violation of patient privacy. This action is often necessary as part of the claims process and is typically done with the patient's consent or as mandated by law.
Choice B Reason:
Discussing laboratory results with a patient's partner without the patient's explicit consent is a violation of patient privacy. Confidentiality is a fundamental principle in healthcare, and disclosing health information to unauthorized individuals, including family members, breaches that confidentiality.
Choice C Reason:
Providing diagnosis codes to a patient's insurance company is a standard procedure and is not considered a violation of patient privacy. This information is necessary for the insurance company to process claims and provide coverage for medical services.
Choice D Reason:
Printing a patient's full name on the specimen label is standard practice and does not violate patient privacy. This is done to ensure that the specimen is correctly identified and matched to the patient, which is critical for accurate diagnosis and treatment.
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