Which of the following is an appropriate technique when preparing a site for venipuncture after applying antiseptic?
Wipe with clean gauze.
Allow to air dry.
Blow on the site.
Wave hands over the site.
The Correct Answer is B
Choice A Reason:
Wiping the site with clean gauze after applying antiseptic is not recommended. This action can remove the antiseptic before it has had sufficient time to disinfect the area, potentially reintroducing bacteria to the site and increasing the risk of contamination.
Choice B Reason:
Allowing the site to air dry after applying antiseptic is the appropriate technique. This ensures that the antiseptic has enough contact time to effectively reduce microbial flora on the skin. Air drying also prevents any potential irritation that might be caused by wiping or touching the site before the venipuncture.
Choice C Reason:
Blowing on the site to speed up drying is not an appropriate technique. This can introduce bacteria from the breath to the clean site, which could lead to contamination and increase the risk of infection.
Choice D Reason:
Waving hands over the site is not an appropriate technique either. This action could potentially contaminate the site with bacteria or particles from the skin or the environment. It is also less effective in ensuring that the antiseptic has dried completely.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A Reason:
Sterile water is not an antiseptic; it does not contain antimicrobial agents. While it can be used to rinse a site, it will not disinfect the area before a venipuncture procedure. Therefore, it is not an appropriate substitute for alcohol in this context.
Choice B Reason:
Antiseptic foam may contain alcohol or other disinfectants. If it is alcohol-free, it could be a suitable alternative. However, without specific information about the ingredients, it cannot be assumed to be an appropriate choice for a patient allergic to alcohol.
Choice C Reason:
Chlorhexidine is a commonly used antiseptic for skin preparation before medical procedures, including venipuncture. It is effective against a broad spectrum of bacteria and is an appropriate alternative for patients who have an allergy to alcohol-based antiseptics.
Choice D Reason:
Saline solution is not an antiseptic. It is a sterile solution of sodium chloride in water and does not have antimicrobial properties. Like sterile water, it is not suitable for disinfecting the venipuncture site.
Correct Answer is A
Explanation
Choice A reason:
Chilling the sample is the correct method for preparing a lactic acid sample for processing and transportation. Lactic acid levels can continue to change after the blood is drawn due to ongoing cellular metabolism. Chilling the sample slows down this metabolism, preserving the accuracy of the lactic acid measurement. The sample should be placed on ice or in a refrigerated environment as soon as possible after collection.
Choice B reason:
While protecting the sample from light is important for some types of specimens, it is not the primary concern for lactic acid samples. The key factor for lactic acid stability is temperature control, not light exposure. Therefore, while it may be beneficial to keep the sample out of direct sunlight, chilling it is the priority to prevent changes in lactic acid levels.
Choice C reason:
Attaching a heat block to the sample is not a recommended method for lactic acid samples. Heat can increase metabolic activity, potentially altering the lactic acid levels in the sample. This would lead to inaccurate results, as the goal is to preserve the state of the sample at the time of collection.
Choice D reason:
Freezing the sample is not typically recommended for immediate processing and transportation of a lactic acid sample. While freezing can preserve certain types of specimens for long-term storage, it is not necessary for short-term transport and can cause issues such as hemolysis, which may interfere with the test results.
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