Which needle size is most appropriate for administering an intradermal injection?
18 gauge, 1 1/2 inch
21 gauge, 1 inch
26-27 gauge, 1/2 inch
23-25 gauge, 5/8 inch
The Correct Answer is C
A. 18 gauge, 1 1/2 inch: An 18-gauge needle is very large and long, typically used for rapid fluid administration or blood transfusions. Using this size for an intradermal injection would cause significant tissue trauma and pain.
B. 21 gauge, 1 inch: A 21-gauge, 1-inch needle is commonly used for intramuscular injections. It is too thick and too long for placement within the dermal layer, increasing the risk of incorrect administration.
C. 26–27 gauge, 1/2 inch: Intradermal injections require a very fine, short needle to deposit medication just beneath the epidermis. A 26–27 gauge needle with a 1/2-inch length allows precise placement and minimizes tissue damage.
D. 23–25 gauge, 5/8 inch: This needle size is more appropriate for subcutaneous injections. It is longer and thicker than needed for intradermal administration and may penetrate too deeply into subcutaneous tissue.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Use a leading zero before a decimal point: A leading zero (e.g., 0.5 mg) prevents misinterpretation of the decimal as a whole number, reducing the risk of tenfold dosing errors and promoting safe medication administration.
B. Write fractions instead of decimals: Fractions are prone to misinterpretation and calculation errors, making them unsafe for documenting medication dosages.
C. Place the unit of measurement before the number: Standard practice places the numeric value first, followed by the unit (e.g., 5 mL), to ensure clarity and prevent confusion.
D. Include a trailing zero after a whole number: Trailing zeros (e.g., 5.0 mg) are unsafe because they can be misread as ten times the intended dose; they should be avoided in medication notation.
Correct Answer is C
Explanation
Calculation:
- Set up the ratio and proportion
Ordered Dose : X = Available Dose : 1 Tablet
200 mg : X = 100 mg : 1
- Solve for X
X = (200 × 1) ÷ 100
X = 200 ÷ 100
X = 2 tablets
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