Medical-Surgical Dosage Calculations
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____ mL = 1 quart or 1 liter
1 mg = gr ____
gr i = ____ mg
gr ____ = 1 g
____mg = 1 g
____ mcg = 1 mg
1000 mg; mcg
Abbott = ____ gtt/mL
Cutter = ____ gtt/mL
Calculate Running Time
: 1000mL D
LR; Infusing at 25 gtt/min; Administration set is 20 gtt/mL. Calculate the Running Time.
- = 25 gtt/min
- SO ....
- 20,000 gtt = 25 gtt/min ⇒ 20,000 ÷ 25
- = 800 min
- Convert⇒ (800÷60=13.3)-(0.33x0.60=0.199)
- = 13 hours and 20 minutes
The concentration per volume administered over an ordered period of time is the most ____________ and ___________ method of drug administration. The administration of potent drugs may be ordered by concentration per minute or hour.
Accurate & Safest
Problem: Infuse Lidocaine 2g in 500mL DW at 2mg/min. What is the rate of flow with a 60gtt/ml set?
- 2000mg : 500mL = 2mg : x mL
- 2000 x = 1000
- x = 0.5 gtt/min (to be given over 1 min)
- = 30 gtt/min
Example: The healthcare provider has prescribed a continuous IV of heparin 25,000 units in 250 mL of NS via infusion pump to infuse at a rate of 18 units/kg/hr. The client weighs 110 pounds. What hourly rate should be set on the infusion pump?
- The nurse must first convert the client’s weight from pounds to kilograms.
- 2.2 lbs = 1 kg
- 2.2 lbs: 1 kg = 110 lbs: x kg
- 2.2x = 110
- x = 50kg
- To calculate the hourly rate for the heparin infusion, multiply the client’s weight in kg by 18 units of heparin:
- 50 x 18 = 900 units of heparin per hour
- Set up the problem to determine the mL per hour that will provide 900 units of heparin per hour.
- 25,000 units : 250mL = 900 units : x mL
- 25,000x = 225,000
- x = 9 mL per hour
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