Math Packet #4

Question 1

Electronic - Infusion “IV” Pump Formula

Answer 1

mL/hr

Side note:
- The mL/h flow rate must be a whole number, if decimal round to nearest whole number.

• mL = MD order

Question 2

Manual IV Formula

Answer 2

mL/min x gtt(DF)/mL

Explanation:
“mL” = MD order / “min” - 60min
x
“DF/gtt” = drop factor tube rate size / mL

EX: 133mL/60 mins x 10gtt/mL

Side note:
- The gtt/min drop rate must be a whole number, if decimal round to nearest whole number.

Question 3

Manual IV Shortcut Method

Answer 3

mL/h /DF constant = gtt/min

EX:
Order D5W 1,000 mL IV to infuse at 200 mL/h
Drop Factor: 15gtt/mL

200mL/4min x gtt/mL
divide both 200 & 4 by 4
= 50gtt/min

Question 4

Manual: Drop Factor (DF) - tube rate size

Answer 4

10
15
20
60

(tube sizing will be on label)

Question 5

Drop Factor (DF) constant

Answer 5

10 DF > 60min = 6min
- 60/10=6

15 DF > 60min = 4min
- 60/15 = 4

20 DF > 60min = 3 min
- 60/20 = 3

60 DF > 60min = 1 min
- 60/60 = 1

Question 6

L = mL equivalent

Answer 6

1 L = 1,000 mL

multiply the volume value by 1000

Question 7

What to do when equation is: XmL / 45min (Infusion)

Answer 7

must multiply by 60min/1hr

EX:
- 100mL / 45 mins

multiply by 60min/1hr
- 100mL/45 min x 60min/1hr
60 min / by 4 = 15
45min / by 15 = 3

cancel out min and multiply across;
- 100mL/3 x 4/hr = 400mL/3hr

then divide 400mL/3hr
- 400ml/3hr = 133.3
round to nearest whole number

Answer = 133ml/hr or gtt/min