This calculator helps determine the correct flow rate for intravenous (IV) fluid administration. Understanding how to calculate IV flow rate is crucial for nurses and healthcare professionals to ensure patients receive the prescribed amount of medication or fluids safely and effectively. The calculation is based on the volume of fluid to be infused and the time over which it should be delivered, often adjusted for the drop factor of the specific IV tubing used.
Common drop factors are 10, 15, 20, 60.
Results:
function calculateIVFlowRate() {
var volumeToInfuse = parseFloat(document.getElementById("volumeToInfuse").value);
var infusionTimeHours = parseFloat(document.getElementById("infusionTimeHours").value);
var dropFactor = parseFloat(document.getElementById("dropFactor").value);
var resultDiv = document.getElementById("result");
var flowRateGttsElement = document.getElementById("flowRateGtts");
var flowRateMlElement = document.getElementById("flowRateMl");
// Clear previous results
flowRateGttsElement.textContent = "";
flowRateMlElement.textContent = "";
resultDiv.style.display = "none";
// Input validation
if (isNaN(volumeToInfuse) || volumeToInfuse <= 0) {
flowRateGttsElement.textContent = "Error: Please enter a valid positive volume to infuse.";
resultDiv.style.display = "block";
return;
}
if (isNaN(infusionTimeHours) || infusionTimeHours <= 0) {
flowRateGttsElement.textContent = "Error: Please enter a valid positive infusion time in hours.";
resultDiv.style.display = "block";
return;
}
if (isNaN(dropFactor) || dropFactor <= 0) {
flowRateGttsElement.textContent = "Error: Please enter a valid positive drop factor.";
resultDiv.style.display = "block";
return;
}
// Calculation for flow rate in drops per minute (gtts/min)
// Formula: (Volume to Infuse (mL) * Drop Factor (gtts/mL)) / Infusion Time (minutes)
var infusionTimeMinutes = infusionTimeHours * 60;
var flowRateGttsPerMinute = (volumeToInfuse * dropFactor) / infusionTimeMinutes;
// Calculation for flow rate in mL per hour (mL/hr)
// Formula: Volume to Infuse (mL) / Infusion Time (hours)
var flowRateMlPerHour = volumeToInfuse / infusionTimeHours;
// Display results
flowRateGttsElement.textContent = "Flow Rate: " + flowRateGttsPerMinute.toFixed(2) + " gtts/min";
flowRateMlElement.textContent = "Flow Rate: " + flowRateMlPerHour.toFixed(2) + " mL/hr";
resultDiv.style.display = "block";
}
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