Nursing practice questions with comprehensive rationales
NurseDive Free Nursing Practice Question
The dosage strength of a solution with a strength of 50% is
A. 5 g of medication per 100 mL solution.
5 g of medication per 100 mL solution: This describes a 5% solution, not a 50% one. A 5% solution means there are 5 grams of drug in 100 mL of solution.
B. 1g of medication per 50 ml. solution.
1 g of medication per 50 mL solution: This reflects a 2% concentration (1 g in 50 mL = 2 g in 100 mL = 2%). It does not match 50% strength.
C. 1:1,000.
1:1,000: A 1:1,000 ratio means 1 gram of medication in 1,000 mL of solution (or 0.1%), which is far more diluted than a 50% solution.
D. 50 g of medication per 100 mL solution.
50 g of medication per 100 mL solution: A 50% solution means there are 50 grams of solute per 100 mL of solution. This is the correct expression of a 50% concentration by weight/volume (w/v).
This question is an excerpt from Nurse Dive's nursing test bank - Dosage calculation proctored exam (hellen fluid college). Take the full exam now
Full Explanation
A. 5 g of medication per 100 mL solution: This describes a 5% solution, not a 50% one. A 5% solution means there are 5 grams of drug in 100 mL of solution.
B. 1 g of medication per 50 mL solution: This reflects a 2% concentration (1 g in 50 mL = 2 g in 100 mL = 2%). It does not match 50% strength.
C. 1:1,000: A 1:1,000 ratio means 1 gram of medication in 1,000 mL of solution (or 0.1%), which is far more diluted than a 50% solution.
D. 50 g of medication per 100 mL solution: A 50% solution means there are 50 grams of solute per 100 mL of solution. This is the correct expression of a 50% concentration by weight/volume (w/v).
Similar Questions
Zinacef 750 mg IV q 8h is ordered. This would be what type of intravenous infusion?
A. KVO
KVO: "Keep vein open" infusions are minimal-rate fluids used to maintain IV line patency, not to deliver active medications like Zinacef. This does not apply to scheduled antibiotic therapy.
B. therapeutic
therapeutic: Zinacef (cefuroxime) is an antibiotic used to treat infections. Since it is being administered on a scheduled basis (750 mg IV q8h), it is used therapeutically to manage a medical condition.
C. replacement
replacement: Replacement fluids are used to restore lost fluids and electrolytes due to vomiting, diarrhea, bleeding, or other losses. They are not used for medication administration.
D. maintenance
maintenance: Maintenance fluids meet basic daily fluid and electrolyte requirements in patients unable to eat or drink. They do not involve scheduled doses of antibiotics or other medications.
Full Explanation
A. KVO: "Keep vein open" infusions are minimal-rate fluids used to maintain IV line patency, not to deliver active medications like Zinacef. This does not apply to scheduled antibiotic therapy.
B. therapeutic: Zinacef (cefuroxime) is an antibiotic used to treat infections. Since it is being administered on a scheduled basis (750 mg IV q8h), it is used therapeutically to manage a medical condition.
C. replacement: Replacement fluids are used to restore lost fluids and electrolytes due to vomiting, diarrhea, bleeding, or other losses. They are not used for medication administration.
D. maintenance: Maintenance fluids meet basic daily fluid and electrolyte requirements in patients unable to eat or drink. They do not involve scheduled doses of antibiotics or other medications.
Which syringe would you select to administer Humulin R U-500 65 units?
Full Explanation
Syringe 1: This U-100 insulin syringe with a 30-unit capacity is inappropriate for this task because the required dose of 65 units exceeds its maximum capacity. This syringe is calibrated for U-100 insulin, and using it for U-500 insulin would lead to a potentially fatal overdose.
Syringe 2: This is a U-100 insulin syringe with a 50-unit capacity. Its capacity is insufficient for the 65-unit dose. Critically, using a U-100 syringe for U-500 insulin would result in a significant medication error and a massive overdose.
Syringe 3: This is a U-100 insulin syringe with a 100-unit capacity. Although the 65-unit dose fits within its capacity, the unit markings are based on U-100 concentration, so drawing to the 65-unit line would actually administer 65 U-100 units, which is a severe overdose of U-500 insulin.
Syringe 4: This is a small-volume syringe calibrated in milliliters, not U-100 units. The proper dose of 65 units of U-500 insulin is calculated as 65 units / 500 units per mL = 0.13 mL. This syringe can accurately and safely measure this specific volume, making it the appropriate choice to prevent a dosing error.
Calculate the amount to administer_________.
Ordered: Filgrastim 120 mcg subcut daily
See label for available medication
Full Explanation
Calculation:
Ordered dose: 120 mcg
- Identify the medication concentration:
The label states the concentration is 300 mcg/mL.
- Calculate the volume to administer.
Volume (mL) = Desired Dose / Available Concentration
= 120 mcg / 300 mcg/mL
= 0.4 mL