Dosage Calculations - Ccma

1. What is the common weight conversion between kilograms and pounds for clinical calculations?

   $1\,\text{kg}=2.2\,\text{lb}$. This factor is the standard approximation for converting body weight between metric and imperial units in healthcare.

2. What is the dose in mg for an order of $10\,\text{mg/kg}$ for a patient weighing $22\,\text{lb}$?

   $100\,\text{mg}$. First convert pounds to kilograms by dividing by 2.2, then multiply by the mg/kg order for total dose.

3. What is $250\,\text{mcg}$ converted to milligrams?

   $0.25\,\text{mg}$. Dividing micrograms by 1000 converts to milligrams as per metric unit scaling.

4. What is the standard formula for tablet dosing using ordered dose, have dose, and quantity?

   $\text{Tablets to give}=\frac{\text{Dose ordered}}{\text{Dose on hand}}\times\text{Quantity}$. This formula calculates the number of tablets by dividing the ordered dose by the dose per unit and multiplying by the quantity available per dose.

5. What is the conversion between liters and milliliters in the metric system?

   $1\,\text{L}=1000\,\text{mL}$. Metric volume units follow a base-10 system where one liter contains 1000 milliliters.

6. What is $45\,\text{mL}$ converted to tablespoons using $1\,\text{tbsp}=15\,\text{mL}$?

   $3\,\text{tbsp}$. Dividing the milliliter volume by 15 yields the equivalent in tablespoons using the standard conversion.

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

   $125\,\text{mL/hr}$. Infusion rate is calculated by dividing total volume by the number of hours for administration.

8. What is the standard formula for liquid medication volume in mL using ordered dose and concentration?

   $\text{mL to give}=\frac{\text{Dose ordered}}{\text{Dose on hand}}\times\text{mL on hand}$. This formula determines the volume in mL by scaling the ordered dose to the concentration and multiplying by the volume containing the dose on hand.

9. What is the conversion between milliliters and cubic centimeters used in medication measurement?

   $1\,\text{mL}=1\,\text{cm}^3$. By definition in measurement systems, one milliliter equals one cubic centimeter for volume equivalence in medication dosing.

10. What is the conversion between grains and milligrams commonly used on exams?

    $1\,\text{gr}=60\,\text{mg}$. Apothecary system conversion commonly approximates one grain to 60 milligrams for exam and clinical purposes.

11. What is the common household-to-metric conversion for 1 teaspoon?

    $1\,\text{tsp}=5\,\text{mL}$. Standard medical conversion approximates a household teaspoon to 5 mL for accurate patient instructions.

12. What is $2\,\text{L}$ converted to milliliters?

    $2000\,\text{mL}$. Liters convert to milliliters by multiplying by 1000 in the metric system.

13. Identify the correct method to convert kilograms to pounds using $1\,\text{kg}=2.2\,\text{lb}$.

    $\text{lb}=\text{kg}\times 2.2$. Multiplication by 2.2 converts kilograms to pounds based on the standard weight equivalence.

14. What is the formula for IV flow rate in $\text{mL/hr}$ when total volume and time in hours are given?

    $\text{mL/hr}=\frac{\text{Total mL}}{\text{Hours}}$. IV infusion rate is found by dividing the total volume by the total time in hours for steady administration.

15. What is the conversion between milligrams and micrograms in the metric system?

    $1\,\text{mg}=1000\,\text{mcg}$. The prefix 'micro' indicates one-thousandth of a milligram, establishing the conversion factor.

16. What is the proportion setup for dosage calculation using label strength (have) and prescribed dose (want)?

    $\frac{\text{Have}}{\text{Quantity}}=\frac{\text{Want}}{x}$. This proportion equates the known have-to-quantity ratio to the wanted dose over the unknown amount for solving dosage calculations.

17. How many tablets should be given if ordered $0.5\,\text{mg}$ and available is $1\,\text{mg}$ per tablet?

    $0.5\,\text{tablet}$. Tablet quantity is determined by dividing the ordered dose by the dose per tablet.

18. What is the conversion between grams and milligrams in the metric system?

    $1\,\text{g}=1000\,\text{mg}$. In the metric system, the prefix 'milli' denotes one-thousandth, so one gram equals 1000 milligrams.

19. Identify the correct method to convert pounds to kilograms using $1\,\text{kg}=2.2\,\text{lb}$.

    $\text{kg}=\frac{\text{lb}}{2.2}$. To convert from pounds to kilograms, divide by the factor since 2.2 pounds equal one kilogram.

20. What is the volume to administer for an order of $250\,\text{mg}$ if available is $500\,\text{mg}/5\,\text{mL}$?

    $2.5\,\text{mL}$. Dosage calculation divides ordered amount by concentration to find the required volume.

21. What is the formula for weight-based dosing when an order is in $\text{mg/kg}$?

    $\text{Dose (mg)}=(\text{mg/kg})\times\text{weight (kg)}$. Weight-based dosing multiplies the per-kilogram dose by the patient's weight to yield the total milligrams required.

22. What is $0.5\,\text{g}$ converted to milligrams?

    $500\,\text{mg}$. Conversion from grams to milligrams requires multiplying by 1000 due to the metric prefix difference.

23. What is the formula for drip rate in $\text{gtt/min}$ using volume, drop factor, and time in minutes?

    $\text{gtt/min}=\frac{\text{mL}\times\text{gtt/mL}}{\text{min}}$. Drip rate calculation multiplies volume by drop factor and divides by minutes to determine drops per minute.

24. What is the common household-to-metric conversion for 1 fluid ounce?

    $1\,\text{fl oz}=30\,\text{mL}$. Clinical practice uses 30 mL as the standard approximation for one fluid ounce in conversions.

25. What is the common household-to-metric conversion for 1 tablespoon?

    $1\,\text{tbsp}=15\,\text{mL}$. A tablespoon is equivalent to three teaspoons, resulting in 15 mL in metric terms for dosing.

Study these flashcards