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## Nursing Math: Dosage and Calculations | Practical Nurse (LPN) School Study Aid

Calculating Medication Dosage
3 Picmonics to Learn | 7 mins
Standard Formula
Memorize the Formula
Dose Ordered
Dose on Hand
Amount on Hand (Quantity)
Before Calculating the Dose
Ensure Same Units and System of Measurement
Calculating the Dose
Dose Ordered/Dose on Hand X Amount on Hand = Amount to Administer
2 mins
IV Calculation Formulas
IV TUBING
Drop Factor
Macrodrip
Microdrip
FLOW RATES
Total Volume to Infuse (mL) X Drop Factor/ Time in Minutes = Drops/Minute (gtt/min)
INFUSION TIME
Total Volume to Infuse / mL per Hour Being Infused = Infusion Time
Number of mL/Hr
Total Volume in mL / Time in Hours = Number of mL per Hour
3 mins
Infusions Prescribed by Unit Dosage per Hour
Step 1
Determine Amount of Medication per 1mL
Known Amount of Medication in Solution/Total Volume of Diluent = Amount of Medication per Milliliter
Step 2
Calculate mL per Hour
Dose per Hour Desired/Concentration per Milliliter = Infusion Rate (mL/hour)
2 mins

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