Which of the following is the correct angle of insertion when performing venipuncture using the evacuated tube method?
50°
30°
90°
75°
The Correct Answer is B
Choice A Reason:
An angle of 50° is too steep for venipuncture and increases the risk of going through the vein and causing injury to structures beneath it. A steeper angle can also make it more difficult to control the depth of the needle, leading to an increased chance of puncturing the posterior wall of the vein.
Choice B Reason:
An angle of 30° is the recommended angle for venipuncture as it allows for a smooth entry into the vein without going too deep. This angle helps to ensure that the needle enters the vein in a controlled manner and minimizes the risk of injury to the patient. It also provides a good balance between ease of entry and control over the needle's depth.
Choice C Reason:
An angle of 90° is not recommended for venipuncture because it is perpendicular to the skin, which greatly increases the risk of passing through the vein entirely and causing injury. This angle does not allow for any control over the depth of the needle and is likely to cause discomfort or pain to the patient.
Choice D Reason:
An angle of 75° is also too steep for safe venipuncture. Similar to a 50° angle, it increases the risk of penetrating the posterior wall of the vein and potentially damaging surrounding tissues or arteries. It is important to use a lower angle to ensure the safety and comfort of the patient during the procedure.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason:
The Apgar score is a quick test performed on a newborn at 1 and 5 minutes after birth. The 1-minute score determines how well the baby tolerated the birthing process. The 5-minute score tells the healthcare provider how well the baby is doing outside the mother's womb. While it is an important indicator of a newborn's health, it does not directly influence the calculation of total blood volume.
Choice B reason:
Height is a measure of the length of a person's body. In the context of a 2-day-old infant, height is not a practical or necessary measurement for determining blood volume. Blood volume is more closely related to weight than to height, especially in the case of infants.
Choice C reason:
Head circumference is a measurement of the size of a child's head and is used to monitor brain growth. While it can provide valuable information about a child's development, it is not used to calculate blood volume. The total blood volume of an infant is not determined by the size of the head but rather by the overall weight.
Choice D reason:
Weight is the correct factor to consider when calculating total blood volume for a full-term, 2-day-old infant. The standard formula to estimate an infant's total blood volume is approximately 80 {mL/kg} of body weight. Therefore, knowing the infant's weight in kilograms is essential for this calculation.
Correct Answer is A
Explanation
Choice A Reason:
Contacting the physician by paging or calling right away is the most appropriate action when critical values are confirmed on a laboratory test. Critical values are defined as those that indicate the patient is in danger of death unless treatment is initiated immediately. Immediate notification of the responsible licensed caregiver is required so that appropriate clinical action can be taken for the patient. This is a standard procedure compliant with CLIA regulation 493.1109(f) and is essential for patient safety.
Choice B Reason:
Leaving a message at the physician's office number is not an adequate response to confirmed critical values. Messages can be overlooked or not checked until the next business day, which could delay necessary urgent medical interventions.
Choice C Reason:
Calling the physician's office on the next business day is not acceptable when dealing with critical values. The urgency of critical results requires immediate action, and waiting until the next business day could result in significant harm or death to the patient.
Choice D Reason:
Faxing the results to the physician's office with a stat fax cover is not sufficient for immediate communication of critical values. While the fax may indicate urgency, there is no guarantee that the fax will be seen immediately by the physician or their staff. Direct communication through paging or calling ensures that the critical information is relayed without delay.
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