Dosage calc. formulas

Question 1

Total grams of solute in a solution

Answer 1

Grams / 100 mL=____ x total volume (mL)= Grams of solute in a solution.

Question 2

You have _____ mL and need ____ mL per hour. How many hours will the IV take?

Answer 2

EX: 
 Have 1000 mL, need 120 mLper hr. 
1000/120= 8.3333
60x0.3= 18 
=8 hrs and 18 min

Question 3

Drops per minute

Answer 3

DF x mL (per hr)= Drops per hr / 60 min= drops per min
EX:
IV D5W 1000mL @ 100 mL per hr; DF is 10.
10 x 100= 1000 drops per hr / 60 min= 16.66= 17 drops

Question 4

IVs given over 20 and 30 minutes

Answer 4

30 min ( multiply by 2)
EX: 80 mL IVPB over 30 min.
80 x 2= 160 mL per hr. 
20 min ( multiply by 3)
EX: 50 mL IVPB over 20 min.
50 x 3= 150 mL per hr.

Question 5

Drop per min to mL per hr

Answer 5

DF / drops per min= mL x 60 min= mL per hr.
EX:
-30 drops per min; DF is 20.
30 drops / 20 DF= 1.5 mL x 60 min= 90 mL per hr.
-8 drops per 30 sec; DF is 10.
8 x 2= 16 drops
16 drops / 10 DF= 1.6 mL x 60 min= 96 mL per hr.
-6 drops per sec; DF is 60.
6 x 4= 24
24 drops / 60 DF= 0.4 mL x 60 min= 24 mL per hr.

Question 6

____ drops per mL= Macrodrip

Answer 6

15, 10 drops per mL= Macrodrip

Question 7

_____ drops per mL= Microdrip

Answer 7

60 drops per mL= Micrpdrip