Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
4 Cards in this Set
- Front
- Back
|
Legend:
gtts = min = hr = ml = |
Legend:
drops minute hour milliliter |
|
|
To get drops per min.
|
Use the formula:
Volume(mL) / Time(min) * DropFactor(gtts/mL) = gtts/min 500 ml over (divided by) 3 hours (180 in min.) X (times) Drop Factor (drop set size) over (divied by) 1 = Drops per min. 500 ml --- 20 (drop set) ------------- X ------------------ 180 --- 1 = 10000 -------- 180 = 55.5 or 56 gtt/min. |
|
|
Volume/Time - IV Drop Rate Questions
Given a certain amount of liquid, a time period, and a drop factor (gtts/mL), what is the necessary IV flow rate in gtts/min? Measurement used when IV is regulated manually. Because it is not possible to give a patient a fraction of a drop, it is typical to round answers for these problems up or down to the nearest whole number |
Formula:
Volume (mL) Time (min) x Drop Factor (gtts/mL) = Y (Flow Rate in gtts/min) Example: Calculate the IV flow rate for 1200 mL of NS to be infused in 6 hours. The infusion set is calibrated for a drop factor of 15 gtts/mL. Volume (mL) Time (min) x Drop Factor (gtts/mL) = Y (Flow Rate in gtts/min) Convert 6 hours to minutes. min ← hr ( x by 60 ) 6 hr x 60 = 360 min 1200 mL 360 min x 15 gtts/mL = 50 gtts/min Example: Calculate the IV flow rate for 200 mL of 0.9% NaCl IV over 120 minutes. Infusion set has drop factor of 20 gtts/mL. Volume (mL) Time (min) x Drop Factor (gtts/mL) = Y (Flow Rate in gtts/min) 200 mL 120 min x 20 gtts/mL = 33 gtts/min |
|
|
The following is an overview of key IV concepts which are useful for dosage calculation problems.
|
Important IV Terms
•gtts: drops • Drop Factor: Number of drops per volume of IV fluid. Varies depending on the tubing used. Usually measured in gtts/mL. • Flow Rate: Measure of the flow of liquid from an IV. Usually measured in gtts/minute (how many drops are released every minute) or in mL/hour (how many mL flow through each hour). gtts/minute is used for manually regulating an IV while mL/hour is used when utilizing an electronic IV regulator. Important IV Abbreviations •D: Dextrose •W: Water •S: Saline •NS: Normal Saline (0.9% NaCl) •RL or LR: Lactated Ringer's |
