A provider orders 40 units of U-100 insulin. Which syringe is most appropriate for this dose?
1 mL insulin syringe
Tuberculin syringe
0.3 mL insulin syringe
0.5 mL insulin syringe
The Correct Answer is D
A. 1 mL insulin syringe: While a 1 mL syringe can hold up to 100 units of U-100 insulin, using it for a 40-unit dose may reduce precision because the markings are more spread out, making it harder to measure accurately.
B. Tuberculin syringe: Tuberculin syringes are designed for very small volumes, usually in milliliters or fractions thereof, and are not calibrated in insulin units, making them inappropriate for accurate insulin dosing.
C. 0.3 mL insulin syringe: A 0.3 mL insulin syringe is typically used for small doses up to 30 units. Administering 40 units in this syringe would exceed its capacity and compromise safe and accurate dosing.
D. 0.5 mL insulin syringe: A 0.5 mL syringe is designed for doses up to 50 units of U-100 insulin. It allows for precise measurement of a 40-unit dose and reduces the risk of dosing errors, making it the most appropriate choice for safe administration.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. 15 mL: One teaspoon is equivalent to 5 mL in the metric system. Therefore, 3 teaspoons equal 3 × 5 mL = 15 mL. This ensures accurate dosing and patient safety.
B. 20 mL: Twenty milliliters would exceed the prescribed dose, resulting in a potential overdose if administered.
C. 30 mL: Thirty milliliters corresponds to 6 teaspoons or 2 tablespoons, which is double the prescribed 3 teaspoons and would be unsafe.
D. 10 mL: Ten milliliters equals 2 teaspoons, which is less than the prescribed amount, leading to underdosing and ineffective therapy.
Correct Answer is D
Explanation
A. Upper arm: The upper arm is an acceptable site for subcutaneous injections, but absorption is slower compared with the abdomen due to less vascularized subcutaneous tissue.
B. Thigh: The thigh is commonly used for subcutaneous injections, but absorption is slower than the abdomen. This site is often chosen for convenience rather than rapid onset.
C. Buttocks: The buttocks have thicker subcutaneous tissue and slower blood flow, resulting in slower absorption of insulin compared with other sites.
D. Abdomen: The abdomen provides the fastest absorption for subcutaneous insulin because it has rich vascularization and a consistent layer of subcutaneous fat, making it ideal for rapid onset of action.
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