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Correct Answer: apply lidocaine ointment on the finger.
when collecting a capillary blood sample from a patient's finger, certain techniques can enhance blood flow and sample quality, making the process more efficient and less uncomfortable for the patient. however, not all methods are appropriate or effective. for example, applying lidocaine ointment on the finger, as mentioned in the question, is not an advisable approach. lidocaine is typically used as a local anesthetic to numb a specific area of the body. when applied to the finger before puncturing for a blood sample, it can interfere with blood flow and the natural response of the body to the puncture, potentially affecting the sample's quality or quantity.
in contrast, other methods like warming the finger using warm compresses or warm flowing water can help dilate the blood vessels, allowing more blood to flow to the area. this makes it easier to obtain a sufficient sample quickly and minimally invasively. holding the finger downward, using gravity to aid blood pooling in the fingertip, is another simple but effective strategy to enhance capillary blood flow. similarly, gently massaging the finger from the base to the tip before puncturing can help increase blood circulation to the fingertip, facilitating an easier and more productive blood draw.
it is critical to avoid applying any substances such as ointments or creams that could contaminate the sample or alter the site's natural responses. before the puncture, the finger should be cleaned with alcohol to sterilize the area, although it's important to ensure that the alcohol has completely dried to avoid contamination and irritation. after the puncture, wiping away the first drop of blood with sterile gauze is a recommended practice as this first drop may contain tissue fluids or remnants of the alcohol swab, which might compromise the accuracy of diagnostic tests.
in summary, while techniques such as warming, massaging, and positioning the finger downward are beneficial for enhancing blood flow and sample quality in capillary blood collection, applying lidocaine ointment does not serve this purpose and is considered an improper method for preparing a patient for a fingerstick blood draw.
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