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Order: 1000 mL of D5½NS with 1 ampule of multiple vitamins to infuse over 8 hours

Available: Macrodrip set: 15 gtt/mL

Calculate the IV flow rate in gtt/min.

A.

31

B.

30

C.

32

D.

3.0

Answer and Explanation

The Correct Answer is A

Given:

Volume of fluid: 1000 mL

Infusion time: 8 hours

Drop factor: 15 gtt/mL

 

Formula:

Flow rate (gtt/min) = (Volume (mL) / Time (hr)) x Drop factor (gtt/mL) / 60 min/hr

 

Step 1: Calculate the infusion rate in mL/hr:

Infusion rate (mL/hr) = Volume (mL) / Time (hr)

Infusion rate (mL/hr) = 1000 mL / 8 hr

Infusion rate (mL/hr) = 125 mL/hr

 

Step 2: Calculate the flow rate in gtt/min:

Flow rate (gtt/min) = (Infusion rate (mL/hr) x Drop factor (gtt/mL)) / 60 min/hr

Flow rate (gtt/min) = (125 mL/hr x 15 gtt/mL) / 60 min/hr

Flow rate (gtt/min) = 1875 gtt/hr / 60 min/hr

Flow rate (gtt/min) = 31.25 gtt/min

 

Step 3: Round to the nearest whole number:

Flow rate (gtt/min) ≈ 31 gtt/min


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Related Questions

Correct Answer is A

Explanation

Given:

Ordered dose of Heparin: 18 units/kg/hr

Patient weight: 123 pounds

Concentration of Heparin: 25,000 units/250 mL (100 units/mL)

Step 1: Convert patient weight from pounds to kilograms:

1 pound (lb) = 0.453592 kilograms (kg)

Patient weight in kg = 123 lbs x 0.453592 kg/lb = 55.7923 kg

Step 2: Calculate the total dose of Heparin in units/hr:

Total dose (units/hr) = Ordered dose (units/kg/hr) x Patient weight (kg)

Total dose (units/hr) = 18 units/kg/hr x 55.7923 kg

Total dose (units/hr) = 1004.2614 units/hr

Step 3: Calculate the infusion rate in mL/hr:

Infusion rate (mL/hr) = Total dose (units/hr) / Concentration (units/mL)

Infusion rate (mL/hr) = 1004.2614 units/hr / 100 units/mL

Infusion rate (mL/hr) = 10.042614 mL/hr

Step 4: Round to the nearest tenths:

Infusion rate (mL/hr) ≈ 10.0 mL/hr

Correct Answer is A

Explanation

Given:

Ordered dose of Dopamine: 3 mcg/kg/min

Child's weight: 41.8 lbs

Concentration of Dopamine: 400 mg in 250 mL D5W

Step 1: Convert child's weight from pounds to kilograms:

1 pound (lb) = 0.453592 kilograms (kg)

Child's weight in kg = 41.8 lbs x 0.453592 kg/lb = 18.935 kg

Step 2: Calculate the total dose of Dopamine in mcg/min:

Total dose (mcg/min) = Ordered dose (mcg/kg/min) x Child's weight (kg)

Total dose (mcg/min) = 3 mcg/kg/min x 18.935 kg

Total dose (mcg/min) = 56.805 mcg/min

Step 3: Convert mcg to mg:

Total dose (mg/min) = Total dose (mcg/min) / 1000 mcg/mg

Total dose (mg/min) = 56.805 mcg/min / 1000 mcg/mg

Total dose (mg/min) = 0.056805 mg/min

Step 4: Calculate the total dose in mg/hr:

Total dose (mg/hr) = Total dose (mg/min) x 60 min/hr

Total dose (mg/hr) = 0.056805 mg/min x 60 min/hr

Total dose (mg/hr) = 3.4083 mg/hr

Step 5: Calculate the infusion rate in mL/hr:

Infusion rate (mL/hr) = Total dose (mg/hr) / Concentration (mg/mL)

Infusion rate (mL/hr) = 3.4083 mg/hr / (400 mg/250 mL)

Infusion rate (mL/hr) = 3.4083 mg/hr x (250 mL/400 mg)

Infusion rate (mL/hr) = 2.1301875 mL/hr

Step 6: Round to the nearest tenth:

Infusion rate (mL/hr) ≈ 2.1 mL/hr

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