# Medical-Surgical Dosage Calculations

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 Author: w0345891 ID: 231621 Filename: Medical-Surgical Dosage Calculations Updated: 2013-08-27 22:35:44 Tags: NURS 1215 Folders: Description: IV Med Conversions; IV Infusion Flow Rate; IV Infusion TImes, IV Infusion Volume; IV Infusion Weight Based Show Answers:

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1. ____ mL = 1 tsp
5 mL
2. ____  mL = 1 tbs
15 mL
3. ____  mL = 1 oz
30 mL
4. ____  mL = 1 pint
500 mL
5. ____ mL = 1 quart or 1 liter
1000 mL
6. 1 mg = gr ____

gr i =  ____ mg

gr ____ = 1 g
1/60 gr

60 mg

gr XV

7. ____mg = 1 g

____ mcg = 1 mg
1000 mg; mcg
8. 1 T =   ____ t
3 t
9. Abbott =  ____ gtt/mL
15  gtt/mL
10. Cutter = ____  gtt/mL
20 gtt/mL
11. Calculate Running Time:
Problem: 1000mL DLR; 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
12. 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
13. 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
14. 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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