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Dosage calculations RN Ati adult medical surgical proctored assessment 3.1
Total Questions : 35
Showing 25 questions, Sign in for moreA nurse is reviewing medications prescribed for a client. For which of the following prescriptions should the nurse contact the provider for clarification?
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A nurse is preparing to administer tobramycin 3 mg/kg/day IM in three divided doses to a client who weighs 85 kg. The amount available is tobramycin 40 mg/mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the dosage of tobramycin for a client who weighs 85 kg, the nurse should first determine the total daily dose by multiplying the weight by the prescribed dose per kg.
This gives 3 mg/kg/day x 85 kg = 255 mg/day.
Next, the nurse should divide the total daily dose by the number of doses per day to get the dose per administration.
This gives 255 mg/day / 3 doses/day = 85 mg/dose.
Finally, the nurse should use the formula D/H x Q to find the volume to be administered, where D is the desired dose, H is the dose on hand, and Q is the quantity on hand.
This gives 85 mg/dose / 40 mg/mL x 1 mL = 2.125 mL/dose.
Therefore, the nurse should administer 2.1 mL of tobramycin per dose to the client.
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A nurse is preparing to administer cefazolin 1 g intermittent IV bolus in 0.9% sodium chloride 250 mL over 30 min. The drop factor on the manual IV tubing is 10 gtt/mL. The nurse should set the manual IV flow rate to deliver how many gtt/min? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the manual IV flow rate, the nurse needs to use the following formula:
Flow rate (gtt/min) = Volume (mL) x Drop factor (gtt/mL) / Time (min)
Plugging in the given values, we get:
Flow rate (gtt/min) = 250 mL x 10 gtt/mL / 30 min
Flow rate (gtt/min) = 2500 gtt / 30 min
Flow rate (gtt/min) = 83.33 gtt/min
The nurse should set the manual IV flow rate to deliver 83 gtt/min.
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A nurse is preparing to administer fentanyl 0.5 mcg/kg via IV bolus to a client who weighs 187 lb. Available is fentanyl 50 mcg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the dose of fentanyl for a client who weighs 187 lb, the nurse needs to convert the weight to kilograms and multiply it by the prescribed dose of 0.5 mcg/kg.
One kilogram is equal to 2.2 lb, so the client's weight in kilograms is 187 / 2.2 = 85 kg.
The dose of fentanyl in micrograms is 85 x 0.5 = 42.5 mcg.
The nurse then needs to divide the dose in micrograms by the concentration of fentanyl in the available solution, which is 50 mcg/mL.
The volume of fentanyl in milliliters is 42.5 / 50 = 0.85 mL.
The nurse should round the answer to the nearest tenth, so the final answer is 0.9 mL.
The nurse should administer 0.9 mL of fentanyl via IV bolus to the client.
A nurse is preparing to administer lisinopril 2.5 mg PO to an older adult client. Available is lisinopril 5 mg tablets. How many tablets should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To give the correct dose of lisinopril to an older adult client, the nurse needs to calculate the number of tablets to administer. The formula for this calculation is:
(number of tablets) = (desired dose) / (available dose)
In this case, the desired dose is 2.5 mg and the available dose is 5 mg. Plugging these values into the formula, we get:
(number of tablets) = (2.5 mg) / (5 mg)
Simplifying the fraction, we get:
(number of tablets) = 0.5
This means that the nurse should administer half a tablet of lisinopril 5 mg to the older adult client.
A nurse is preparing to administer exenatide 10 mcg subcutaneous. Available is exenatide 250 mcg/mL. How many mL should the nurse administer? (Round the answer to the nearest hundredth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
o calculate the dose of exenatide, the nurse should use the following formula:
Dose (mL) = Desired dose (mcg) / Available dose (mcg/mL)
Plugging in the values from the question, we get:
Dose (mL) = 10 mcg / 250 mcg/mL
Dose (mL) = 0.04 mL
The nurse should administer 0.04 mL of exenatide subcutaneously.
A nurse is preparing to administer ceftriaxone 250 mg IM to an adult client who has a gonococcal infection. The label on the vial indicates to reconstitute each vial with sterile water 2.1 mL to yield ceftriaxone 350 mg/mL. How many mL of the reconstituted medication should the nurse administer? (Round the answer to the nearest hundredth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the dose of ceftriaxone for an adult client with a gonococcal infection, the nurse needs to use the following formula: Dose (mL) = Ordered dose (mg) / Available dose (mg/mL).
In this case, the ordered dose is 250 mg and the available dose is 350 mg/mL.
Therefore, the nurse should administer 250 / 350 = 0.71 mL of the reconstituted medication.
The answer should be rounded to the nearest hundredth, so the final answer is 0.71 mL.
A nurse is preparing to administer phenobarbital 2 mg/kg/day IV divided in 2 equal doses to a client who weighs 165 lb. Available is phenobarbital 65 mg/mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the dose of phenobarbital for this client, the nurse needs to convert the client's weight from pounds to kilograms.
One kilogram is equal to 2.2 pounds, so the nurse can divide 165 by 2.2 to get 75 kg.
Next, the nurse needs to multiply the client's weight by the prescribed dose of 2 mg/kg/day to get the total daily dose of phenobarbital.
This is 75 x 2 = 150 mg/day.
Since the dose is divided in 2 equal doses, the nurse needs to divide 150 by 2 to get the amount of phenobarbital per dose. This is 75 mg/dose.
Finally, the nurse needs to use the available concentration of phenobarbital to determine how many mL to administer per dose.
The nurse can use a proportion to solve this problem: 65 mg/mL = 75 mg/x mL.
Cross-multiplying and solving for x gives x = 1.15 mL.
Therefore, the nurse should administer 1.15 mL of phenobarbital per dose. Rounded off is 1.2ml.
A nurse is preparing to administer prednisone 15 mg PO to a client who has rheumatoid arthritis. Available is prednisone 10 mg tablets. How many tablets should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the dosage of prednisone for a client with rheumatoid arthritis, the nurse needs to apply the formula: D/H x Q = X, where D is the desired dose, H is the dose on hand, Q is the quantity, and X is the amount to administer.
In this case, D is 15 mg, H is 10 mg, and Q is 1 tablet.
Plugging these values into the formula, we get: 15/10 x 1 = 1.5.
Therefore, the nurse should administer 1.5 tablets of prednisone to the client.
A nurse is preparing to administer metronidazole 7.5 mg/kg via intermittent IV bolus to a client who weighs 212 lb. Available is metronidazole 500 mg/100 mL. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
First, let's convert the client's weight from pounds to kilograms: 212 lb / 2.2 lb/kg ≈ 96.36 kg
Next, calculate the total dose of metronidazole: 7.5 mg/kg * 96.36 kg ≈ 727 mg
Now, let's determine how many milliliters of the available metronidazole solution (500 mg/100 mL) contains the prescribed dose of 727 mg: (727 mg / 500 mg) * 100 mL = 145.4 mL
Rounded to the nearest whole number, the nurse should administer approximately 145 mL of metronidazole.
A nurse is preparing to reconstitute amoxicillin/clavulanate potassium oral suspension for administration to a client who has a respiratory tract infection. According to the label, what actions should the nurse take? (Refer to the medication label below.)
Directions for mixing:
Tap bottle until all powder flows freely. Add approximately 2/3 of total water for reconstitution (total = 67 mL)
Shake vigorously to wet powder. Add remaining water, again shake vigorously. Dosage: See accompanying prescribing information
Tear along perforation
Keep tightly closed.
125 mg/5 mL AMOXICILLIN/ CLAVULANATE POTASSIUM FOR ORAL SUSPENSION
when reconstituted, each 5mL contains: AMOXICILLIN 125 mg. as the trihydrate
CLAVULANIC ACID, 31.25 mg, as clavulanate potassium
Shake well before using.
Must be refrigerated
Discard after 10 days.
A nurse is preparing to administer heparin 7,500 units subcutaneous. Available is heparin 10,000 units/mL. How many mL should the nurse administer? (Round the answer to the nearest hundredth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Explanation:
To calculate the dosage of heparin, the nurse needs to use the following formula: D/H x V = A, where D is the desired dose, H is the dose on hand, V is the volume on hand, and A is the amount to administer.
In this case, D is 7,500 units, H is 10,000 units, and V is 1 mL. Plugging these values into the formula, we get:
7,500/10,000 x 1 = 0.75
Therefore, the nurse should administer 0.75 mL of heparin.
A nurse is preparing to administer gentamicin 5 mg/kg via intermittent IV bolus to a client who weighs 210 lb. The amount available is gentamicin 10 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the dosage of gentamicin for a client who weighs 210 lb, the nurse needs to convert the weight to kilograms first.
One kilogram is equal to 2.2 lb, so the client's weight in kilograms is 210 / 2.2 = 95.45 kg.
The prescribed dose is 5 mg/kg, so the total dose for the client is 5 x 95.45 = 477.25 mg.
The available concentration is 10 mg/mL, so the volume to be administered is 477.25 / 10 = 47.725 mL.
Rounding to the nearest whole number, the nurse should administer 48 mL of gentamicin via intermittent IV bolus.
A nurse is preparing to administer calcitonin 8 units/kg IM to a client who weighs 130 lb. Available is calcitonin 200 units/mL for injection. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the amount of calcitonin to administer, the nurse needs to convert the client's weight from pounds to kilograms and then multiply it by the prescribed dose.
One kilogram is equal to 2.2 pounds, so the client's weight in kilograms is 130/2.2 = 59.09 kg.
The prescribed dose is 8 units/kg, so the total dose is 8 x 59.09 = 472.72 units.
The available concentration is 200 units/mL, so the volume to administer is 472.72/200 = 2.36 mL.
Rounding to the nearest tenth, the nurse should administer 2.4 mL of calcitonin IM.
A nurse is preparing to administer cefazolin 500 mg IM every 8 hr. Available is cefazolin 1 g vial. The package insert instructs adding 2.5 mL of sterile water to yield cefazolin 330 mg/mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the dosage of cefazolin, the nurse needs to use the following formula:
Dose (mL) = Ordered dose (mg) / Available dose (mg/mL)
Plugging in the values from the question, we get:
Dose (mL) = 500 mg / 330 mg/mL
Dose (mL) = 1.515 mL
Rounding to the nearest tenth, the nurse should administer 1.5 mL of cefazolin per dose.
A nurse is preparing to administer amoxicillin 775 mg PO. Available is amoxicillin oral suspension 400 mg/5 mL. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Explanation:
To calculate the dose of amoxicillin oral suspension, the nurse should use the following formula:
Dose (mL) = Desired dose (mg) / Available dose (mg/mL) x Volume (mL)
Plugging in the values from the question, we get:
Dose (mL) = 775 mg / (400 mg/5 mL) x 5 mL
Dose (mL) = 9.6875 mL
Rounding to the nearest whole number, the nurse should administer 10 mL of amoxicillin oral suspension.
A nurse is caring for a client who reports taking 1 Tbsp of guaifenesin oral solution every 4 hr. The concentration on the client's bottle reads guaifenesin 100 mg/5 mL. How many mg of guaifenesin is the client taking with each dose? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the amount of guaifenesin that the client is taking with each dose, we need to convert the volume of the oral solution to milliliters and then use the concentration to find the corresponding mass of guaifenesin.
One tablespoon is equivalent to 15 mL, so the client is taking 15 mL of guaifenesin oral solution every 4 hr. The concentration of the solution is 100 mg of guaifenesin per 5 mL of solution, so we can use a proportion to find the mass of guaifenesin in 15 mL of solution:
100 mg / 5 mL = x mg / 15 mL
Cross-multiplying and solving for x, we get:
x = (100 mg / 5 mL) * 15 mL
x = 300 mg
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A nurse is preparing to administer clindamycin 1,200 mg IV bolus over 1 hr to a client who is allergic to penicillin. Available is clindamycin 1,200 mg in dextrose 5% in water 100 mL. The drop factor on the manual IV tubing is 15 gtt/ml. The nurse should set the flow rate to deliver how many gtt/min? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the flow rate for the IV bolus, the nurse should use the following formula: flow rate (gtt/min) = volume (mL) x drop factor (gtt/mL) / time (min).
In this case, the volume is 100 mL, the drop factor is 15 gtt/mL, and the time is 60 min.
Plugging these values into the formula, we get: flow rate (gtt/min) = 100 x 15 / 60 = 25 gtt/min.
Therefore, the nurse should set the flow rate to deliver 25 gtt/min.
A nurse is preparing to administer dextrose 5% in water 1,000 mL IV to Infuse over 6 hr. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the infusion rate for dextrose 5% in water 1,000 mL IV, the nurse should use the following formula: Volume (mL) / Time (hr) = Rate (mL/hr).
In this case, the volume is 1,000 mL and the time is 6 hr.
Therefore, the rate is 1,000 mL / 6 hr = 166.67 mL/hr.
Therefore, the nurse should round up to 167 mL/hr.
A nurse is preparing to administer 0.9% sodium chloride 1,500 mL IV to be infused over 12 hr. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
This is a question that tests the nurse's ability to calculate the infusion rate for an IV fluid. To solve this problem, the nurse needs to use the formula:
Infusion rate (mL/hr) = Volume (mL) / Time (hr)
Plugging in the given values, we get:
Infusion rate (mL/hr) = 1,500 mL / 12 hr
Simplifying, we get:
Infusion rate (mL/hr) = 125 mL/hr
A nurse is preparing to administer 0.45% sodium chloride 2.5 L IV to infuse over 24 hr. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the infusion rate for 0.45% sodium chloride 2.5 L IV over 24 hr, the nurse should use the following formula: infusion rate (mL/hr) = volume (mL) / time (hr).
Since 1 L = 1000 mL, the volume of the solution is 2500 mL.
Therefore, the infusion rate is 2500 mL / 24 hr = 104.17 mL/hr.
To find the amount of solution to administer in one hour, the nurse should round the infusion rate to the nearest whole number, which is 104 mL/hr.
A nurse is preparing to administer promethazine 25 mg IM to a client. Available is promethazine 50 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the correct dosage of promethazine for a client, the nurse needs to use the formula D/H x V, where D is the desired dose, H is the available dose, and V is the available volume. In this case, D is 25 mg, H is 50 mg, and V is 1 mL. Plugging these values into the formula, we get:
A nurse is preparing to administer epoetin alfa 7,000 units subcutaneous once a week to a client. Available is epoetin alfa 20,000 units/mL. How many mL should the nurse administer? (Round the answer to the nearest hundredth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the dosage of epoetin alfa for a client, the nurse needs to use the following formula:
Dose (mL) = Ordered dose (units) / Available dose (units/mL)
Plugging in the values from the question, we get:
Dose (mL) = 7,000 units / 20,000 units/mL
Dose (mL) = 0.35 mL
The nurse should administer 0.35 mL of epoetin alfa to the client once a week.
A nurse is preparing to administer ondansetron 0.15 mg/kg IV to a client who weighs 132 lb. Available is ondansetron 2 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
s is a question that tests the ability to perform dosage calculations for medications. To answer this question, we need to follow these steps:
1. Convert the client's weight from pounds to kilograms by dividing by 2.2. 132 lb / 2.2 = 60 kg.
2. Multiply the client's weight by the prescribed dose of ondansetron to get the total dose in mg. 60 kg x 0.15 mg/kg = 9 mg.
3. Divide the total dose by the concentration of the available ondansetron solution to get the volume in mL. 9 mg / 2 mg/mL = 4.5 mL.
Therefore, the nurse should administer 4.5 mL of ondansetron IV to the client.
A nurse is preparing to administer epoetin alfa 7,000 units subcutaneous once a week to a client. Available is epoetin alfa 20,000 units/mL. How many mL should the nurse administer? (Round the answer to the nearest hundredth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
To calculate the dosage of epoetin alfa for a client, the nurse needs to use the following formula:
Dose (mL) = Ordered dose (units) / Available dose (units/mL)
Plugging in the values from the question, we get:
Dose (mL) = 7,000 units / 20,000 units/mL
Dose (mL) = 0.35 mL
The nurse should administer 0.35 mL of epoetin alfa to the client once a week.
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