NURS2503 Seminar_ IV Calculation ST BB W25
Kam ELECTRONG G IV Administration & Calculations - NURS2503 Dosage Calculation Seminar: Week 4
Page 1: Introduction
Introduction to IV administration and calculations related to the nursing course NURS2503.
Page 2: Learning Objectives
Calculate IV Flow Rates
Apply formulas to calculate IV flow rates in mL/h.
Calculate IV flow rates in drops per minute.
Utilize standard and shortcut formulas for IV flow rate calculations.
Calculate flow rates for IV medications over specified time.
Identify correct dosages using weight-based data.
Apply formulas to calculate flow rates for enteral feeds.
Determine total volume of infusion patient will receive based on flow rate and duration.
Page 3: IV Therapy: Adults
Overview of IV therapy practices specifically for adults.
Page 4: Brief Review
Review of key points:
Round to the nearest whole number for mL/h.
Can be administered with or without an electronic pump.
Specific or continuous infusion periods.
Gravity or pump delivery methods.
Page 5: Calculating Rates for IV Infusion Pumps
Factors to Identify:
Volume (mL).
Time (hours).
Round flow rate to nearest whole number or tenths based on equipment.
Formula: mL/hr = volume (mL) / time (hr).
Page 6: Practice Question
Problem: Infuse 3,000 mL over 24 hours.
Calculation:
mL/hr = 3000 mL / 24 hrs = 125 mL/hr.
Page 7: Practice Question #1
Problem: Infuse 2,500 mL over 24 hours.
Calculation: mL/hr = Amount of solution / Time in hours.
Page 8: Calculating Flow Rates for Infusion Pumps (<1 h)
Formula to use for infusions under an hour:
x mL/hr = amount of solution (mL) X 60 minutes / time (minutes).
Page 9: Calculating Flow Rates for Orders
Order Example: 4500mg of Penicillin in 100 mL over 30 minutes.
Calculation:
x mL/hr = 100 mL X 60 / 30 min = 200 mL/hr.
Page 10: Practice Question #2
Order: 4.5 g Zosyn in 100 mL NS IV in 30 min BID.
What is the rate in mL/h?
Page 12: Flow Rate Formula Method
Formula for calculating flow rates:
mL/h = total mL to infuse x 60 min/h / number of minutes to infuse.
Page 13: Flow Rate Calculation Example
Example: Order: 4.5 g Zosyn in 100 mL NS IVPB in 30 min.
Calculation: mL/h = 100 mL / 30 min x 60 min/h = 200 mL/h.
Page 14: Calculating Flow Rates - Safety Alert
Usual IV rates range from 50–200 mL/h.
Important to double-check order and calculations if the rate exceeds this range.
Page 15: IV Flow Rate Calculations in Drops per Minute
Introduction to IV flow rate calculation in drops per minute (gtt/min).
Page 16: IV Tubing Types
Types of Tubing:
Macrodrop: standard for general infusions (delivers 10, 15, or 20 gtt/mL).
Microdrop: delivers smaller drops (60 gtt/mL).
Page 18: Drops per Minute Formula Method
Formula to calculate drip rate:
gtt/min = Amt of solution (mL) x drop factor (gtt/mL) / Time in min.
Page 19: Example of a Drop Rate Calculation
Problem: Infuse NS at 100 mL per hour with drop factor of 10 gtt/mL.
Calculation: gtt/min = 100 mL x 10 gtt/mL / 60 min = 16.6 gtt/min.
Page 21: Practice Question #3
Order: Infuse RL at 125 mL per hour. Drop factor 15 gtt/mL.
What is the rate in gtt/min?
Page 22: Practice Question #4
Order: Infuse D5W at 75 mL per hour. Drop factor 10 gtt/mL.
Page 23: Practice Question #5
Order: Infuse 1000 mL of 2/3 & 1/3 over 6 hours. Drop factor 10 gtt/mL.
Steps: Calculate mL/h; Calculate gtt/min.
Page 25: Shortcut Method Using Constants
Using drop factor constants for quick calculations.
Examples of constants:
10 gtt/mL = 6; 15 gtt/mL = 4; 20 gtt/mL = 3; 60 gtt/mL = 1.
Page 26: Example Problem (Drop Factor Calculation)
Administering 0.9% NS at 100 mL/h, drop factor = 20 gtt/mL.
Standard formula vs shortcut calculation.
Page 28: Practice Question #6
Order: Infuse 1 L of NS at 100 mL per hour. Drop factor 20 gtt/mL. What is the rate in gtt/min?
Page 30: IV Therapy: Children
Special considerations for IV therapy in children.
Page 31: IV Therapy and Children Guidelines
Use microdrop IV tubing (DF 60 gtt/mL), electronic devices, or both.
Follow institutional protocols for flush amounts.
Page 32: Calculating IV Medication by Burette
Formula used: gtt/min = Total volume (mL) x drop factor (gtt/mL) / Time in minutes.
Page 33: Burette/Pump Example
Example: Antibiotic infusion and flush process explained step-by-step.
Page 36: Volume of Infusion Calculation
How to calculate total infusion volume based on rate and time.
Page 37: Practice Calculation for Total Volume of Infusion
Example: Patient receiving D5W at 150 mL/hr over 12 hours.
Calculation led to total volume = 1800 mL.
Page 41: Time of Infusion Calculation
Calculating the infusion time based on total volume and rate.
Page 46: Key Points for Recalculating IV
If IV flow is drastically off schedule:
Notify prescriber.
Each situation should be assessed individually.
Recalculated rates should not differ by more than 25% from original.
Page 48: Recalculating IV Flow Rate Practice Problem
Example of recalculating IV flow rate based on volume and time remaining.
Page 50: Enteral Feeding Rate Calculation
Order for Pulmocare feeding rates, followed by water.
Page 56: Dosage per Hour Calculation
Calculation for rate in mL/hr based on ordered dosage.
Page 58: Heparin Calculations Overview
Overview of calculating heparin dosages and rates for infusion.