Pediatric Dosage Calculations (Mg/Kg) - NCLEX Rn

1. What is the formula for doses per day when a medication is ordered q24h?

   $\text{doses/day} = \frac{24}{24} = 1$. Divides 24 hours by the 24-hour interval to find the daily dose count.

2. Calculate mL per dose: ordered dose $80\text{ mg}$; supply concentration is $16\ \text{mg/mL}$.

   $5\text{ mL}$. Divides the ordered milligrams by the concentration to compute the milliliters needed per dose.

3. What is the formula for doses per day when a medication is ordered q6h?

   $\text{doses/day} = \frac{24}{6} = 4$. Divides 24 hours in a day by the 6-hour interval to determine the number of doses administered daily.

4. Calculate mg per dose: order $40\ \text{mg/kg/day}$, weight $15\text{ kg}$, frequency q12h.

   $300\text{ mg/dose}$. Divides the total daily milligrams by the number of doses (2 for q12h) to calculate milligrams per dose.

5. State the formula to convert a required dose in mg to tablets when supply is $\text{mg/tablet}$.

   $\text{tablets} = \frac{mg}{\text{mg/tablet}}$. Divides the required milligrams by the strength per tablet to determine the number of tablets per dose.

6. Calculate mL per dose: ordered dose $125\text{ mg}$; supply concentration is $25\ \text{mg/mL}$.

   $5\text{ mL}$. Divides the ordered milligrams by the supply concentration to determine the volume in milliliters per dose.

7. Calculate the dose in mg: order $10\ \text{mg/kg/dose}$ for a child weighing $18\text{ kg}$.

   $180\text{ mg}$. Multiplies the mg/kg/dose rate by the child's weight to compute the total milligrams per dose.

8. Calculate mg per dose: order $30\ \text{mg/kg/day}$, weight $10\text{ kg}$, frequency q8h.

   $100\text{ mg/dose}$. Divides the total daily milligrams by the number of doses (3 for q8h) to obtain milligrams per dose.

9. Identify the correct mg/kg setup: order is $12\ \text{mg/kg/dose}$ and weight is $8\text{ kg}$.

   $12\ \text{mg/kg} \times 8\text{ kg}$. Multiplies the mg/kg rate by the weight in kilograms to set up the calculation for total dose in milligrams.

10. Calculate tablets per dose: ordered dose $250\text{ mg}$; supply is $125\ \text{mg/tablet}$.

    $2\ \text{tablets}$. Divides the ordered milligrams by the milligrams per tablet to find the number of tablets required.

11. Find the mg/dose: order $15\ \text{mg/kg/dose}$, weight $6\text{ kg}$, give q12h.

    $90\text{ mg/dose}$. Multiplies the mg/kg/dose rate by the weight to compute the milligrams per dose, independent of q12h frequency.

12. What is the formula for doses per day when a medication is ordered q8h?

    $\text{doses/day} = \frac{24}{8} = 3$. Divides 24 hours by the 8-hour interval to calculate the daily dose frequency.

13. Find the mg/dose: order $60\ \text{mg/kg/day}$, weight $20\text{ kg}$, frequency q6h.

    $300\text{ mg/dose}$. Divides the total daily milligrams by the 4 doses (for q6h) to determine milligrams per dose.

14. What is the formula for doses per day when a medication is ordered q12h?

    $\text{doses/day} = \frac{24}{12} = 2$. Divides 24 hours by the 12-hour interval to compute doses per day.

15. Calculate the total daily dose in mg: order $25\ \text{mg/kg/day}$ for a child weighing $12\text{ kg}$.

    $300\text{ mg/day}$. Multiplies the mg/kg/day rate by the weight to find the total daily milligrams required.

16. Identify the correct step if weight is given in lb for a $\text{mg/kg}$ order before calculating mg.

    $\text{Convert lb to kg: } kg = \frac{lbs}{2.2}$. Ensures weight is in kilograms by dividing pounds by 2.2 prior to applying the mg/kg dosage calculation.

17. Calculate tablets per dose: ordered dose $75\text{ mg}$; supply is $50\ \text{mg/tablet}$.

    $1.5\ \text{tablets}$. Divides the ordered milligrams by the tablet strength to calculate the number of tablets per dose.

18. What is the formula for calculating a single dose in mg when the order is $\text{mg/kg/dose}$?

    $mg = (\text{mg/kg/dose}) \times kg$. Multiplies the dosage per kilogram per dose by the patient's weight to determine the total milligrams for a single dose.

19. State the formula to convert a required dose in mg to mL using a concentration labeled $\text{mg/mL}$.

    $mL = \frac{mg}{\text{mg/mL}}$. Divides the required milligrams by the concentration in mg/mL to obtain the volume in milliliters needed.

20. State the formula to calculate mg per dose from an order written as $\text{mg/kg/day}$ and given $q\#h$.

    $mg/dose = \frac{(\text{mg/kg/day})\times kg}{\text{doses/day}}$. Divides the total daily milligrams by the number of doses per day to find the milligrams per individual dose.

21. What is the formula for calculating total daily dose in mg when the order is $\text{mg/kg/day}$?

    $mg/day = (\text{mg/kg/day}) \times kg$. Multiplies the daily dosage per kilogram by the weight to calculate the total milligrams required per day.

22. Calculate the child's weight in kg: weight is $44\text{ lb}$. Round to the nearest tenth.

    $20.0\text{ kg}$. Divides pounds by 2.2 and rounds to the nearest tenth to convert to kilograms for accurate dosing.

23. State the formula to convert a weight in pounds to kilograms for pediatric dosing calculations.

    $kg = \frac{lbs}{2.2}$. Divides pounds by 2.2 to convert to kilograms, ensuring compatibility with mg/kg dosing units.

24. State the formula to convert a weight in kilograms to a weight in pounds for dosing work.

    $ lbs = kg \times 2.2$. Multiplies kilograms by the conversion factor of 2.2 to obtain equivalent pounds for dosing calculations.

25. Calculate the child's weight in kg: weight is $22\text{ lb}$. Round to the nearest tenth.

    $10.0\text{ kg}$. Divides pounds by 2.2 and rounds to the nearest tenth to obtain weight in kilograms.

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