Dosage Calculation RN Maternal Newborn Proctored Assessment 3.2

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Sample questions from Dosage Calculation RN Maternal Newborn Proctored Assessment 3.2

This material has 90 questions with answers and rationales. Here are the first 5.

1. 1.At an antepartum clinic, a client at 28 weeks' gestation is prescribed ferrous sulfate 650 mg by mouth daily. The tablets available contain 325 mg each. How many tablets should the client take per dose?

   • A.2 tablets
   • B.3 tablets
   • C.4 tablets
   • D.1 tablet

   Rationale: Divide the prescribed dose, 650 mg, by the amount in each tablet, 325 mg, to obtain 2 tablets. One tablet supplies only 325 mg, while 3 and 4 tablets supply 975 mg and 1,300 mg, respectively. For oral medications, verify that the tablet strength and prescribed dose use the same units before calculating.

2. 2.The provider prescribes amoxicillin 500 mg by mouth every 8 hours for a pregnant client with a urinary tract infection. The suspension contains 250 mg per 5 mL. How many milliliters should be administered per dose?

   • A.7.5 mL
   • B.5 mL
   • C.15 mL
   • D.10 mL

   Rationale: The concentration is 250 mg in 5 mL, so 500 mg requires 10 mL. Five milliliters provides only 250 mg, and 7.5 mL provides 375 mg; 15 mL provides 750 mg. Calculate the volume for one dose, not the total amount for the full day.

3. 3.A client at 31 weeks' gestation is admitted for severe preeclampsia. The prescription is magnesium sulfate 4 g IV as a loading dose. The solution contains 20 g in 500 mL. What volume should be infused for the loading dose?

   • A.50 mL
   • B.100 mL
   • C.75 mL
   • D.125 mL

   Rationale: The concentration is 20 g divided by 500 mL, or 0.04 g/mL; 4 g therefore requires 100 mL. A volume of 50 mL provides 2 g, while 75 mL provides 3 g and 125 mL provides 5 g. For a concentrated medication, use the labeled concentration to calculate the dose volume rather than assuming a standard volume.

4. 4.During a home visit, a client receiving antepartum magnesium sulfate asks how the infusion pump rate was determined. The prescription is 2 g/hour, and the bag contains 20 g in 500 mL. What pump rate delivers the prescribed dose?

   • A.25 mL/hour
   • B.75 mL/hour
   • C.50 mL/hour
   • D.100 mL/hour

   Answer and rationale are in the full material.

5. 5.A primigravida at 30 weeks' gestation is prescribed regular insulin 6 units and NPH insulin 18 units subcutaneously before breakfast. Which statements about the dose and preparation are correct? Select all that apply.

   • A.The NPH insulin dose is 18 units.
   • B.The total volume to draw up is 24 units on a U-100 insulin syringe.
   • C.The regular insulin dose is 6 units.
   • D.When mixing the insulins in one syringe, withdraw the clear insulin before the cloudy insulin.
   • E.When mixing the insulins in one syringe, withdraw the cloudy insulin before the clear insulin.

   Answer and rationale are in the full material.