Question

Ordered: 500ml 0.45% NS with heparin 25,000 U to infuse at 500 units/hr what is the flow rate

Answer 1

The flow rate for the 500 mL 0.45% NS with Heparin 25,000 U infusion is 10 mL/hr. Option 1 is correct.

To solve this problem

We require knowledge on the solution's total volume, concentration, and intended infusion rate.

• The solution's total volume is 500 mL.
• Solution concentration: 0.45% NS stands for normal saline.
• Goal infusion rate: 500 units per hour

The concentration of heparin in the solution must first be ascertained. Since the NS solution has a 0.45% concentration, water makes up the remaining 0.55%. This indicates that there are 50 units of heparin per milliliter (25,000 units / 500 mL) in the solution.

Now, we can use the formula for the flow rate of a medication infusion:

Flow rate (mL/hr) = (Desired infusion rate (units/hr)) / (Concentration of medication (units/mL))

Plugging in the values we know, we get:

Flow rate (mL/hr) = (500 units/hr) / (50 units/mL) = 10 mL/hr

So, the flow rate for the 500 mL 0.45% NS with Heparin 25,000 U infusion is 10 mL/hr.

Answer 2

0.0625 mL/hr.

Explanation:

To calculate the flow rate in mL/hr, we need to know the total volume of the solution, the concentration of the solution, and the desired infusion rate.

Given:

Volume: 500 mL

Concentration: 0.45% (or 0.0045 g/mL)

Infusion rate: 500 units/hr

We know that:

Infusion rate = Volume x Concentration / Time

We can rearrange the formula to solve for time:

Time = Volume x Concentration / Infusion rate

Now we can plug in the given values:

Time = 500 mL x 0.0045 g/mL / 500 units/hr

To convert the time to hours, we will divide the time by 3600 seconds/hour

Time = 500 mL x 0.0045 g/mL / 500 units/hr / (1 hr/3600 s)

Now we have the flow rate in mL/hr

Time = 0.0625 mL/hr

So the flow rate should be set at 0.0625 mL/hr.

It's important to note that the heparin added is 25000 U, this is not related to the flow rate calculation.