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Discussion

Help with calculating flow rate

1. A 50 mL IV is to infuse in 15 minutes. The set calibration is 15gtt/mL. After 5 minutes, the IV contains 40 mL. Calculate the flow rate to deliver the volume on time.

2. An IV of 1000mL is ordered to run at 25mL/hr using a microdrip set

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    • Featured Replies

    • Author

    I keep coming up with the wrong answer I just need someone to explain it to me by setting it up

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    I keep coming up with the wrong answer I just need someone to explain it to me by setting it up

    Show us what you are doing and we can help you find what you're doing wrong.

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    • Author

    1. 40mL/10min x 15gtt--I get the wrong answer for this

    2. 975mL x 60 min ??

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    1. 40mL/10min x 15gtt--I get the wrong answer for this

    2. 975mL x 60 min ??

    Ok, look at what you are doing here.

    For #1, You need to infuse 40 mL in 10 min, I agree. So what does that mean, 4 mL/min, right?

    So 4 mL/min x your drop factor of 15 gtts/mL = ? gtts/min.

    For #2, where are you getting 975 mL from? Your problem is:

    An IV of 1000mL is ordered to run at 25mL/hr using a microdrip set

    Why would you subtract 25 mL from 1000 mL? That is not a step to figure this out.

    Do you know what a microdrip set is? You need to know that to work this problem.

    You don't say in this question what they are looking for- the gtts/min? If so, the 1,000 mL is irrelevant. You are running an IV at 25 mL/hr. How do you get from that to drops/min?

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    • Experts

    [TABLE=class: formula]

    [TR]

    [TD][TABLE=class: fraction]

    [TR]

    [TD=class: numerator]Volume(mL)[/TD]

    [/TR]

    [TR]

    [TD=class: denominator] Time (min)[/TD]

    [/TR]

    [/TABLE]

    [/TD]

    [TD] x Drop Factor (gtts/mL) = Y (Flow Rate in gtts/min) ..[/TD]

    [/TR]

    [/TABLE]

    DosageHelp.com - Helping Nursing Students Learn Dosage Calculations - Volume/Time - IV Drop Rate Questions

    40ml

    10min x 15gtts/1ml = _____gtts/min

    (40ml divided by 10min = 4ml then that answer 4ml x (times) 15gtts (the gtt rate) Will give you 60 gtts/min.

    For the second......define what a micro gtt is...what is the gtt factor for a micro gtt?

    25ml

    60min (60 min to 1 hour) x 60ggts/min = _____ml/cc/hr

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