Advanced dosage calculation scenarios including titrated drips, pediatric weight-based dosing, and unit conversions.
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- What formula is used to calculate the amount of a drug to give, based on the desired dose and the dose on hand?
- D/H x Q (Desired dose divided by Have, times Quantity)
- What is the formula for IV flow rate in drops per minute (gtt/min)?
- (Volume in mL divided by Time in minutes) x drop factor (gtt/mL)
- What is the typical drop factor range for macrodrip IV tubing?
- 10 to 20 gtt/mL
- What is the drop factor for microdrip IV tubing?
- 60 gtt/mL
- 1 kilogram equals how many pounds?
- 2.2 pounds
- 1 milligram equals how many micrograms?
- 1000 micrograms
- 1 gram equals how many milligrams?
- 1000 milligrams
- 1 liter equals how many milliliters?
- 1000 milliliters
- What is the formula to convert a mcg/min drip order into mL/hr?
- (Dose in mcg/min x 60) divided by concentration in mcg/mL
- What is the formula to convert a mcg/kg/min drip order into mL/hr?
- (Dose in mcg/kg/min x weight in kg x 60) divided by concentration in mcg/mL
- How is a weight-based pediatric dose in mg calculated from an order in mg/kg/dose?
- Multiply the mg/kg/dose ordered by the patient's weight in kilograms
- Before calculating a pediatric dose given a weight in pounds, what must be done first?
- Convert the weight from pounds to kilograms by dividing by 2.2
- What is the Mosteller formula for body surface area (BSA)?
- BSA (m squared) = square root of (height in cm x weight in kg divided by 3600)
- BSA-based dosing is most commonly used for which category of drugs?
- Chemotherapy drugs
- Under the Holliday-Segar (4-2-1) rule, what maintenance fluid rate applies to the first 10 kg of body weight?
- 4 mL/kg/hr