Dosage, dilution, and days-supply calculation setups explained step by step for the PTCB exam.
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- What is the formula for calculating days supply of a medication?
- Days supply = total quantity dispensed / quantity used per day
- How do you calculate the total quantity needed to fill a prescription?
- Total quantity = dose x frequency per day x days supply
- What dilution formula relates a stock solution's concentration and volume to a diluted solution's?
- C1V1 = C2V2
- In C1V1 = C2V2, what does C1 represent?
- The concentration (strength) of the starting stock solution
- In C1V1 = C2V2, what does V2 represent?
- The final volume of the diluted solution
- What calculation method finds the ratio of two different strengths needed to make a desired intermediate strength?
- Alligation
- In an alligation alternate grid, where is the desired final concentration placed?
- In the center of the grid
- What is alligation medial used to calculate?
- The resulting strength when combining two or more quantities of known, different strengths
- What is the formula for weight-based (mg/kg) drug dosing?
- Dose = patient weight (kg) x dose per kg (mg/kg)
- What is the standard conversion factor for changing pounds to kilograms?
- Divide the weight in pounds by 2.2
- What formula estimates body surface area (BSA) using the Mosteller method?
- BSA (m^2) = square root of [(height in cm x weight in kg) / 3600]
- How is a medication dose calculated when dosing is based on body surface area?
- Dose = BSA (m^2) x dose per m^2
- How many milliliters are in 1 teaspoon?
- 5 mL
- How many milliliters are in 1 tablespoon?
- 15 mL
- How many milliliters are in 1 fluid ounce?
- 30 mL