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### Karch’s Focus on Nursing Pharmacology, 9th Ed., Tucker | Registered Nurse (RN) School Study Aid

Chapter 05: Dosage Calculations
7 Picmonics to Learn | 13 mins
IV Solutions
Hypotonic (< 280 mOsm/L)
1/4 Normal Saline (0.225% NaCl)
1/2 Normal Saline (0.45% NaCl)
Isotonic (280-300 mOsm)
Normal Saline (0.9% NaCl)
Lactated Ringer's (LR)
Dextrose 5% in Water (D5W)
Hypertonic (> 300 mOsm)
3% or 5% NaCl
Dextrose 5% in 0.45% NaCl
Dextrose 10% in Water (D10W)
3 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
Conversions: Temperature
0° C = 32° F
How to Convert Celsius to Fahrenheit
°C x 1.8 + 32 = °F
1 min
Conversions: Weight
1000 mcg = 1 mg
1000 mg = 1 g
1000 g = 1 kg
2.2 lb = 1 kg
1 min
Conversions: Volume
Volume
1 mL = 1 cc
5 mL = 1 Tsp
15 mL = 1 Tbsp
30 mL = 1 oz
1000 mL = 1L
2 Tbsp = 1 oz
8 oz = 1 Cup
2 mins
Conversions: Pounds and Kilograms
2.2 lb (pounds)
1 kg (kilogram)
Know Your Own Weight
37 secs