Additional Practice OB Dosage Calculations Answers PDF

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Additional Practice OB Dosage Calculations 1. Order: Administer magnesium sulfate 6 g bolus over 25 minutes, then 3.5 g/h On-hand: magnesium sulfate 40 g in 500 ml D5W a. What is the volume of solution required to administer the bolus? b. What is the rate in ml/hr for the bolus dose? c. What is the rate in ml/hr for the maintenance (hourly) dose? Always ask first: What are they asking for? Volume=mL, Rate=mL/hr, Time= Min or hrs, etc.… A. What is the VOLUME (mL) of the BOLUS? a. d/h x q= v b. 6g/40g x 500mL= 75mL B. What is the RATE (mL/hr) for the BOLUS? a. Use the volume from A (75mL) b. 75mL x 60min = 180mL/hr 25min 1hr *The rate is going to be larger than the volume bc it needs to go into the patient within 25 minutes (a shorter amount of time) C. What RATE (mL/hr) for the MAINTENANCE dose? a. d/h x q= 3.5g/40g x 500mL = 43.75 or 44mL/hr *Rate is equal to volume if not a bolus dose or a timed infusion

2. Order: Administer Pitocin, starting at 2 mu/min IVPB and increase every 15 minutes by 2 mu/min until contractions are every 3 minutes and lasting 60 seconds, as long as the fetus demonstrates no distress. On-hand: Pitocin 30 units in 1000 ml of lactated ringers a. What is the starting rate in ml/hr for the Pitocin infusion? b. At what rate will the Pitocin infusion be when the dose is 10 mu/min? c. If the IV infusion pump is infusing 40 ml/hr, how many mu/min of Pitocin is the patient receiving? d. The patient’s mainline infusion of lactated ringers is infusing at 125 ml/hr via a 20 ggt/ml tubing set. How many drops per minute would the nurse expect to set the follow rate if there was a major power failure and the infusion pump was not working?

A. What is the starting RATE (mL/hr) a. 2mu/min i. 2mu/min x 1000ml x 60min = 4mL/hr 30,000mu 1hr ii. Or

2mu x 1000ml x 60min (whichever way you do it) 1min 30,000mu 1hr 1. Don’t forget to convert 30u to 30,000mu before using it in your equation. 2. Always look for a rounding directions!!!

B. What RATE if dose is 10mu/min? i. 10mu/min x 1000ml x 60min = 20mL/hr 30,000mu 1hr ii. OR

10mu x 1000ml x 60min 1 min 30,000mu 1hr

C. How many MU/MIN is patient receiving if RATE is 40mL/hr? a. This equation you will have to work backwards, to get to mu/min b. 40mL x 30,000mu x 1hr = 20mu/min 1hr 1000mL 60min *Start with what you know and continue to cross things out until you end with the correct labels on top and bottom. So we convert mL/hr to mu/min D. How many GTTS/MIN will you set the flow rate? a. First remember what you have and what you want to get to. b. 125mL x 1hr x 20gtts = 41.66666 or 42gtts/min 1hr 60min 1mL

3. Order: Administer 35 ml of fortified breast milk (24 cal/ounce) every 3 hours via orogastric (OG) tube a. What amount of breast milk is the infant receiving every 24 hours? In milliliters:_____________________________________________ In ounces:_______________________________________________ b. How many calories is the infant receiving in 24 hours? A. How many mLs in 24 hours? a. First how many feedings does this infant receive in 24 hrs? i. 24/3=8 feeds in 24 hours b. 35mL x 8 feeds = 280mL/day 1 feed 1 day B. How many ounces in 24 hours? a. First know 30 mL=1oz b. Second convert A’s solution to oz c. 280mL x 1oz = 9.33333 or 9.3oz/day 1day 30mL C. How many CALS in 24 hours a. Calories per oz are given in question b. Use B’s solution to convert oz/day to cals/day c. 9.3oz x 24cal = 223.2 cal/day 1day 1oz

4. Order: Administer 30 mg/kg via IV of Drug X to an infant that is reported to weigh 6 pounds 7 ounces. On hand: Drug X 5 mg/ml a. How many kg does the infant weigh? b. How many mg is required for the ordered dose? c. How many ml will the nurse administer? A. How many KG does 6lb 7oz equal? a. Know conversions: 1kg = 2.2lbs and 1lb = 16oz b. First convert oz to lbs i. 7oz x 1lb = 0.4375 or 0.44lbs 16oz ii. Then add 6lbs to 0.44lbs = 6.44lbs c. Convert lbs to kg i. 6.44lbs x 1kg = 2.92727 or 2.93kg 2.2lb B. How many mg of medication for 30mg/kg med? a. Use A’s solution for kg b. 2.93kg x 30mg = 87.9mg 1kg C. How many MLS of medication will you administer? a. Use B’s solution for starting mg b. Question gives concentration of drug 5mg/mL c. 87.9mg x 1mL = 17.58 or 17.6mL 5mg 5. Order: Administer insulin drip IVPB at 12 units/hr. On-hand: Regular insulin 100 units in 250 ml bag of normal saline (NS) a. What is the rate in ml/hr to set the infusion pump in order to give the required dose? A. What RATE (ml/hr) to give ordered medication? a. d/hxq b. 12u x 250mL = 30mL/hr 100u...