Obstetrics Dosage Calculation Worksheet 01

OB-PEDS PRACTICE MATH
1. Magnesium sulfate 30 grams is mixed in 500 mf Lactated
Ringers. Order: infuse a maintenance dose of magnesium sulfate
@ 4 grams/hour. How many ml/hr will the IV run?
Magnesium Sulfate; 30 grams in 500 ml lactate ringer
= 30/500 = 0.06 grams/ml Order; 4 grams/hr
= 4/0.06 (As the concentration is 0.06 grams/ml) = 66.666 ml/hr should run
the IV



2. Begin a Pitocin infusion at 5 mu/min via IV pump for labor induction. On




s
hand is Pitocin 40units in 1000ml Lactated Ringers. How many ml/hr will




a
ew
the IV run?
8ml/hour (Pitocin infusion rate via IV pump = 5mu/min
Pitocin lactated ringers = 40 units = 5 mu / 40,000 milliunit X 1000mL


c
= 0.125 ml/min = multiply by 60 min = 0.125 x 60 ml/hr
ur
= 8ml/hr
so
3. The nurse notes the patient's IV pump is set at 10ml/hr. The IV bag
se ia re

holds 30 units of Pitocin mixed in 500ml of Lactated Ringers. How
many mu/min is the client receiving?
m
ur d v y



Given that, the IV pump is at the flow of 10 ml / hr
Co re tud


co
The 500 ml IV is diluted with 30 unit of the drug.
o.
s




hence the 1 ml has 0.06 unit ( = 0.06)
er
is




Here the 1 hr the flow is 10 ml, it means 0.6 units per hour.
Th


H



Hence for 1 hour the flow is 0,6 units, then for 1 minutes it would be 0.01 units.

Therefore the client is receiving 0,01 units per minute,, If we convert the unit into mu it would be
a




0.00001 mu
sh




Therefore the answer is 0.00001 mu / mins.




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