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5 mL syringe: A 5 mL syringe could hold 1.5 mL, but the larger size makes precise measurement more difficult. Small-volume IV medications require a syringe that allows for accurate dosing to prevent under- or over-administration.

1 mL syringe: A 1 mL syringe cannot hold 1.5 mL, making it inappropriate for this dose. Using it would require multiple draws, increasing the risk of error and contamination.

10 mL syringe: A 10 mL syringe is too large for accurately measuring 1.5 mL. Using a syringe much larger than the dose reduces precision and control during IV push administration.

3 mL syringe: A 3 mL syringe has larger gradations and is less precise for small doses like 0.25 mL. Using it could lead to inaccurate measurement and potential under- or overdosing.

5 mL syringe: A 5 mL syringe is too large for accurately measuring 0.25 mL. The coarse markings make precise dosing difficult, increasing the risk of medication errors.

10 mL syringe: A 10 mL syringe is unsuitable for small-volume medications, as the markings are not fine enough to measure 0.25 mL accurately, leading to a high risk of dosing errors.

Tuberculin syringe calibrated in milliliters: Tuberculin syringes are calibrated in milliliters, not insulin units. Using this type requires conversion from units to volume, which increases the risk of dosing errors for insulin administration.

5 mL syringe calibrated in milliliters: A 5 mL syringe is too large and calibrated in milliliters, making it imprecise for accurately measuring 50 units of U-100 insulin. Precision is critical to avoid hypo- or hyperglycemia.

3 mL syringe calibrated in milliliters: A 3 mL syringe measures volume in milliliters rather than units. Using it for insulin requires conversion calculations, which increases the likelihood of errors, especially with smaller doses.

18-gauge, 3 inch needle: An 18-gauge, 3-inch needle is excessively long and large for a standard IM injection, increasing the risk of tissue trauma and patient discomfort. This size is generally reserved for specialized procedures, such as aspiration or blood donation.

25-gauge, 5/8 inch needle: A 25-gauge, 5/8-inch needle is too short and narrow for IM injections of viscous medications. Using this needle could result in subcutaneous administration, reducing absorption and efficacy.

27-gauge, 1/2 inch needle: A 27-gauge, 1/2-inch needle is appropriate for intradermal or subcutaneous injections but not for viscous IM injections. Its small diameter and short length would make injecting a thick medication difficult and ineffective.

1 mL syringe with a 27-gauge, 1/2 inch needle: This combination is too small and short for an adult intramuscular injection. It is more appropriate for intradermal or subcutaneous injections and may not reach the muscle tissue adequately.

5 mL syringe with a 21-gauge, 2 inch needle: While the needle is long enough for an IM injection, a 5 mL syringe is unnecessarily large for a 1 mL dose, making precise administration more difficult and increasing the risk of dosing errors.

Tuberculin syringe with a 26-gauge, 3/8 inch needle: Tuberculin syringes with short, fine needles are suitable for intradermal or subcutaneous injections, not for adult IM injections. The needle length is insufficient to reach the muscle layer.

30-gauge: A 30-gauge needle is very fine and typically used for subcutaneous or intradermal injections. It is too small for deep intramuscular injections, making it difficult to inject medication efficiently, especially if the solution is viscous.

18-gauge: An 18-gauge needle is large and generally used for intravenous access or viscous fluid administration. It is unnecessarily large for routine IM injections and may cause excessive tissue trauma.

25-gauge: A 25-gauge needle is fine and often used for subcutaneous injections. It is too narrow for deep IM injections, especially if the medication is thick, which could make administration difficult and painful.

Administer insulin immediately after drawing it into the syringe without verification: Administering insulin without verification increases the risk of dosing errors, hypoglycemia, or hyperglycemia. Proper checks are essential to patient safety and medication accuracy.

Use the largest syringe available to ensure accuracy: Using a larger syringe for a small insulin dose decreases precision and increases the likelihood of dosing errors. Insulin-specific syringes calibrated in units are preferred for accurate administration.

Shake the insulin vial vigorously to mix the solution: Shaking insulin can denature the protein and affect its effectiveness. Proper mixing involves gentle rolling, not vigorous shaking, but the most important safety step remains verifying type and dose.

1/4 inch: A 1/4-inch needle is generally too short for intradermal injections in adults, potentially making it difficult to deliver the medication into the dermal layer properly.

1 inch: A 1-inch needle is too long for intradermal injections, increasing the risk of injecting the medication into subcutaneous tissue rather than the dermis, which can affect absorption and reaction.

1/2 inch: A 1/2-inch needle may be used in some cases but is on the shorter side for adults. It may not provide optimal control for intradermal placement.

10 mL syringe: A 10 mL syringe is too large for accurately measuring 0.8 mL. Using a larger-capacity syringe reduces precision and increases the risk of dosing errors, making it inappropriate for small-volume medications.

5 mL syringe: A 5 mL syringe has markings that are too coarse for accurately measuring 0.8 mL. Small-volume doses require a syringe with finer gradations to ensure precise administration.

3 mL syringe: A 3 mL syringe is designed for larger volumes and has less precise markings for doses under 1 mL. While it could technically hold 0.8 mL, it is less accurate than a 1 mL syringe and increases the potential for inaccuracy in dosing.