Medication Dosage Calculations - NCLEX Rn

1. What is the calculated dose in mg for $0.1\ \text{mg/kg}$ if the patient weighs $20\ \text{kg}$?

   $2\ \text{mg}$. Calculates the total dose by multiplying the per-kilogram dose by the patient's weight.

2. What volume is administered if the order is $500\ \text{mg}$ and supply is $250\ \text{mg}/5\ \text{mL}$?

   $10\ \text{mL}$. Applies the desired over have multiplied by quantity formula to find the liquid volume to administer.

3. What is the conversion between milligrams and micrograms?

   $1\ \text{mg} = 1000\ \text{mcg}$. Establishes the metric conversion for precise dosing between milligrams and micrograms.

4. What is the conversion between liters and milliliters?

   $1\ \text{L} = 1000\ \text{mL}$. Offers the metric volume conversion essential for fluid and IV calculations.

5. What is the conversion between milliliters and fluid ounces?

   $1\ \text{fl oz} = 30\ \text{mL}$. Provides the conversion factor for fluid ounces to milliliters in volume-based calculations.

6. What is the drops per minute formula using drop factor, volume, and time?

   $\text{gtt/min} = \frac{\text{mL} \times \text{gtt/mL}}{\text{min}}$. Computes drops per minute by multiplying the volume by the drop factor and dividing by the time in minutes.

7. What is the dose in mg if $0.25\ \text{g}$ is ordered?

   $250\ \text{mg}$. Converts grams to milligrams by multiplying by 1000 to match common medication units.

8. What is the formula for infusion time in hours when volume and mL/hr are known?

   $\text{hr} = \frac{\text{mL}}{\text{mL/hr}}$. Finds the infusion duration by dividing the total volume by the hourly rate.

9. What is the conversion between minutes and hours used for IV calculations?

   $1\ \text{hr} = 60\ \text{min}$. Facilitates time unit conversion necessary for accurate IV infusion rate adjustments.

10. What is the drip rate in gtt/min for $100\ \text{mL}$ over $30\ \text{min}$ with $15\ \text{gtt/mL}$ tubing?

    $50\ \text{gtt/min}$. Determines the drip rate using the formula of volume times drop factor divided by minutes.

11. What is the IV rate in mL/hr for $1000\ \text{mL}$ to infuse over $8\ \text{hr}$?

    $125\ \text{mL/hr}$. Computes the hourly rate by dividing the total volume by the infusion time in hours.

12. What is the mL/hour formula for an IV infusion when volume and time are given?

    $\text{mL/hr} = \frac{\text{mL}}{\text{hr}}$. Determines the hourly infusion rate by dividing the total volume by the infusion time in hours.

13. What is the basic dose formula using desired, have, and quantity (D/H × Q)?

    $\text{Dose to give} = \frac{D}{H} \times Q$. Calculates the volume to administer by dividing the desired dose by the available concentration and multiplying by the quantity per unit.

14. What is the conversion between grams and milligrams?

    $1\ \text{g} = 1000\ \text{mg}$. Provides the metric conversion factor for shifting between grams and milligrams in medication dosing.

15. What is the conversion between kilograms and pounds used in dosage calculations?

    $1\ \text{kg} = 2.2\ \text{lb}$. Serves as the standard weight conversion factor for calculating body weight-based dosages.

16. What is the drip rate in gtt/min for $120\ \text{mL/hr}$ with a drop factor of $20\ \text{gtt/mL}$?

    $40\ \text{gtt/min}$. Converts mL per hour to drops per minute by multiplying by drop factor and dividing by 60.

17. What is the dose in mcg if $0.06\ \text{mg}$ is ordered?

    $60\ \text{mcg}$. Converts milligrams to micrograms by multiplying by 1000 for precise small-dose calculations.

18. What is the conversion between milliliters and teaspoons?

    $1\ \text{tsp} = 5\ \text{mL}$. Represents the standard household measurement conversion for administering liquid medications via teaspoon.

19. What is the infusion time in hours for $500\ \text{mL}$ running at $125\ \text{mL/hr}$?

    $4\ \text{hr}$. Calculates infusion duration by dividing the total volume by the hourly infusion rate.

20. What is the patient weight in kg if the weight is $154\ \text{lb}$?

    $70\ \text{kg}$. Converts pounds to kilograms by dividing by 2.2 for weight-based dosing accuracy.

21. What is the mL dose if the order is $0.4\ \text{mg}$ and supply is $1\ \text{mg}/2\ \text{mL}$?

    $0.8\ \text{mL}$. Uses ratio-proportion or the basic dose formula to compute the injectable volume based on concentration.

22. What is the tablet dose if the order is $750\ \text{mg}$ and tablets are $250\ \text{mg}$ each?

    $3\ \text{tablets}$. Determines the number of tablets by dividing the ordered dose by the strength per tablet.

23. What is the insulin syringe unit-to-mL equivalence used for U-100 insulin?

    $100\ \text{units} = 1\ \text{mL}$. Defines the concentration standard for U-100 insulin, allowing precise unit-to-volume conversions.

24. What is the formula to convert an IV rate from mL/hr to gtt/min?

    $\text{gtt/min} = \frac{\text{mL/hr} \times \text{gtt/mL}}{60}$. Converts milliliters per hour to drops per minute by multiplying by the drop factor and dividing by 60 minutes per hour.

25. What is the conversion between milliliters and tablespoons?

    $1\ \text{tbsp} = 15\ \text{mL}$. Indicates the standard conversion for tablespoon measurements in oral liquid dosing.

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