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Dosage Calculations 2025 Exam Questions
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Tridil is infusing at 15 mL/hr on an infusion pump. The drug is mixed 50 mg in 500 mL DsW. How many mcg/min is the patient receiving? Answer: 25 mcg/min First, convert the 50 mg to mcg. 50 mg = 50,000 mcg Now, how many mcg is in 1 mL? 50,000 mcg/500 mL = 100 mcg/mL Now, how many mcg/hr is the pt receiving? 100 mcg x 15 mL = 1,500 mcg/hr So, 1500 mcg/60 min = 25 mcg/min How many mL in a tablespoon (T or tbs)? 15
How many mL in one ounce? 30 Convert 0.3 g to kg. 300 How many ounces in a cup? 8 How many mL in a cup? 240 Convert 22.2 kg to lbs. 48.84 lbs Convert 89 kg to lbs.
Convert 8 lbs 4 oz to kg. 3.8 kg You are caring for a patient at home who must take magnesium hydroxide/aluminum hydroxide (Maalox) 30 mL PO. How many tbsp will you instruct the patient to take? 2 Order: Biaxin 200 mg p.o. q 12 h for a child who weighs 45 lbs. Have: Biaxin 125 mg per 5 mL Biaxin label states 15 mg/kg/day in two equal doses. Is this dosage safe?
- Convert lbs to kgs. 45lbs = 20.5 kg
- Calculate the recommended dose per day. A child weighing 20.5 kg can have 307. mg PER DAY. So, divide 307.5 by 2 to get a single dose. So, the maximum single dose is 153.75 mg.
- NO, the ordered dose is not safe. The doctor ordered 200 mg which is more than 153.75 mg.
How many mcg in a mg? 1000 Order: D5LR 1250 mL IV over 8 hours. What is the infusion rate in mL/h? Answer: 156 mL/h Divide 1250 by 8 156.25 => 156 Order: Amoxil 200 mg q 8 h Have: 50 mg/ml Label: 20 to 40 mg/kg/day in divided doses every 8 hours. The patient weighs 10 kg. Is this order safe?
How many pounds are in a kilogram?
Convert 21.3 kg to lbs.
A patient has a bottle of warfarin (Coumadin) 5 mg tablets at home. After his most recent international normalized ratio (INR), the doctor calls and tells him to take 7. mg/day. How many tablets (scored) should the patient take?
We have an expert-written solution to this problem! If your IV bag says 5% dextrose solution, what does the 5% represent? There are 5 g of dextrose per 100 ml in the bag. Order: NS 0.9% 250 mL IV over the next 4 hours How many mL per hour will you infuse? Answer: 63 mL/h
250 mL divided by 4 is 62.5. Round to the nearest whole number. Order: Ampicillin 500 mg IV in 50 mL in D5 1/2NS in 30 minutes. What is the infusion rate in mL/h? Answer: 100 mL/h Divide total mL by total minutes, then multiply by 60. (total mL ordered/total minutes) x 60 minutes (50 mL/30 min) x 60min 1.67 x 60 = 100.2 => 100 mL/h OR Convert 30 min to hours. 30 min = 0.5 hours 50 mL/0.5 = 100 mL/h
Continuous fluids are constant and run your entire shift. Order: Ancef 2 gm IVPB in 100 mL D5W in 45 minutes What is the infusion rate? Answer: 133 mL/h (100/45) x 60 = 133.3 => 133 You have an IVPB of ranitidine (Zantac) 50 mg in 50 mL D5W to run over 30 minutes. The tubing has a drip factor of 15. How many drops per minute will you set on the IV infusion controller? Answer: 25 gtt/min (volume in mL/time in min) x drip factor (50/30) x 15 1.67 x 15 = 25.05 => 25 We have an expert-written solution to this problem!
You need to administer 250 mg of erythromycin (Erythrocin) PO. You have on hand 0. g tablets. How many tablet(s) will you give?
We have an expert-written solution to this problem! 1 grain = ___ mg 64.8 mg (60) gr. X = _____ mg Answer: 600 mg In this problem, X represents the roman numeral 10. So, the question is asking how many mg in 10 grains. 1 grain = 60 mg, so 10 grains = 600 mg 1 gm = _____ gr. 15 2 gm = _____ gr.
1/4 gr. = _____ mg Answer: 15 Convert 1/4 to a decimal => 0.25, then solve Order: Armour Thyroid gr. X by mouth daily Supply: 300 mg tablets How many tablets will you administer per dose? Answer: 2 Convert the grains to mg. gr. X means 10 grains. Since 1 grain = 60 mg, 10 grains = 600 mg, so you need 2 tablets. Order: Tylenol 1 gm by mouth q 6 h as needed for pain Supply: 5 gr. capsules How many capsules will you give? Answer: 3 Convert 1 gm to grains. 1 gm = 15 grains.
So, you need 3 of the 5 gr. capsules to make 15 gr. Order: liquid suspension Aspirin 180 mg p.o. daily Supply: gr. V per 2 mL How many mL will you administer per dose? Answer: 1.2 mL First, convert 180 mg to gr. So, 180 mg = 3 gr. Set up your equation. I set up my equations by putting what I NEED = to what I am SUPPLIED x (mL needed) over 3 gr. = 2 mL over 5 gr Solve for x by cross multiplying. Order: Diazepam 5 mg IV for q 6 h for agitation as needed Supply: gr. iss/2mL (the ss has a line over the top) How many mL will you administer per dose? Answer: 0.1 mL
How many mL will you administer per dose? Answer: 3. First, convert 1/8 to a decimal. 1/8 grain = 0.125 grain. Now convert grains to mg. 0. grain = 7.5 mg. Set up your equation. I set up my equations by putting what I NEED = to what I am SUPPLIED. x (mL needed) over 7.5 mg = 1 mL over 2 mg Solve for x by cross multiplying. Convert 0.75 to a fraction. Write down 0.75 divided by 1. (0.75/1) Multiply the top and bottom by 100. You are multiplying by 100 because there are 2 digits after the decimal. If there were only 1 digit, you would multiply by 10. If there were 3 digits, you would multiply by 1000. 4 digits would be 10000 and so on. After multiplying top and bottom by 100, you will have 75 over 100. Now, simplify this by dividing each by 25 (largest number that will go into each evenly). Now, you have 3 over 4, so 0.75 has been converted into the fraction 3/4. Note: If you're not sure what the largest number is that will go into each, just start with the one you know. In this instance you could start with 5 or 25. Just keep reducing until you can no longer divide each one with the same number and still get a whole number.
Convert 0.625 to a fraction. Write down 0.625 over 1. (0.625/1) Multiply the top and bottom by 1000. You are multiplying by 1000 because there are 3 digits after the decimal. If there were only 1 digit, you would multiply by 10. If there were 2 digits, you would multiply by 100. 4 digits would be 10000 and so on. After multiplying top and bottom by 1000, you will have 625 over 1000. Now, simplify this by dividing each by 125 (largest number that will go into each evenly). Now, you have 5 over 8, so 0.625 has been converted into the fraction 5/8. Note: If you're not sure what the largest number is that will go into each, just start with the one you know. In this instance you could start with 5 or 25. Just keep reducing until you can no longer divide each one with the same number and still get a whole number. The MD orders your patient to start an IV Heparin drip at 18 units/kg/hr and to administer a loading bolus dose of 30 units/kg IV before initiation of the drip. You're supplied with a Heparin bag that reads 25,000 units/500 mL. The patient weighs 172 lbs. What is the flow rate you will set the IV pump at (mL/hr) and the amount of units for the IV bolus? Answer: 28 mL/h, Bolus: 2346 units First, convert 172 lbs to kg. 172 lbs = 78.2 kg The doctor wants 18 units per kg. So, multiply 78.2 by 18 to get 1407.6 units.
0800 - 1000: 3 Liters of bladder irrigation 1000: emptied Foley catheter 3600 mL 1100: 1 Liter of bladder irrigation 1200: 2 Liters of bladder irrigation and emptied 3250 mL from Foley catheter 1300: 1 Liter of bladder irrigation 1400: 1 Liter of bladder irrigation 1500: 1 Liter of bladder irrigation and emptied 3120 mL from Foley Catheter 1600 - 1900: 3 Liters of bladder irrigation 1900: emptied 4200 mL from Foley catheter Intake: 2170 mL Remember, irrigation in NOT urine. You can not count it. The patient received 3000 mL of irrigation from 0800-1000. When the Foley cath was emptied at 10, there was a total of 3600 mL. 3000 mL of that was irrigation fluid. Only 600 mL was urine and considered output. Your patient's recent PTT is 45. According to protocol, you need to increase the Heparin drip by 2 units/kg/hr and administer 30 units/kg IV bolus. You will recheck the PTT in 6 hours. The patient is currently receiving a Heparin drip at 22 units/kg/hr from a bag that reads 25,000 units/250 mL. The patient weighs 129 lbs. How many units will the patient receive as a bolus, and how many units per kilogram per hour will the patient receive based on the new PTT result? Answer: bolus will be 1758 units, increase drip to 24 units/kg/h
Convert 129 lbs to kg => 58.6 kg To calculate the bolus, multiply 58.6 by 30 to get 1758 Your patient has a Heparin drip running at 29 mL/hr. The Heparin bag reads 10, units/ 100 mL. How many units per hour is the patient receiving? Answer: 2900 units/hr There is more than one way to solve this. This is the way easiest for me to understand. First, I want to figure out how many units are in 1 mL. Simply divide 10000 by 100 to get 100 units/mL. We are administering 29 mL/hr. We know each mL has 100 units, so multiply 29 by 100 to get 2900 units/hr. Your patient has a Heparin drip running at 24 mL/hr. The Heparin bag reads 12, units/250 mL. How many units per hour is the patient receiving? Answer: 1200 units/hr There is more than one way to solve this. This is the way easiest for me to understand. First, I want to figure out how many units are in 1 mL. Simply divide 12,500 by 250 to get 50 units/mL.
