NTA Level 5 • Semester 2 • PST05208

Calculations Involving Rate of Flow of Intravenous

Pharmaceutics Theory and Compounding • Source Session/Topic 21

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Session 21: Calculations Involving Rate of Flow of Intravenous

Fluid

Total Session Time: 120minutes + 6 hours of Practices

Prerequisites

• None

Learning Tasks

By the end of this session students are expected to be able to:

• Give overview of calculations involving rate flow of Intravenous Fluid

• Perform calculations Involving rate of flow of Intravenous

Resources Needed:

• Flip charts, marker pens, and masking tape

• Black/white board, chalk and whiteboard markers

• LCD projector and computer

SESSION OVERVIEW

Activity/

Step Time Content

Method

1 05 minutes Presentation Introduction, Learning Tasks

45minutes Introduction to Calculations Involving Rate Flow

2 Presentation of Intravenous Fluid

60 minutes Presentation Performing Calculations Involving Rate of flow

3 of Intravenous Fluids

Demonstration

4 05 minutes Presentation Key Points

5 05 minutes Presentation Evaluation

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SESSION CONTENTS

STEP1: Presentation of Session Title and Learning Tasks (5 minutes)

READ or ASK students to read the learning tasks and clarify

ASK students if they have any questions before continuing

STEP 2: Rate of Flow of Intravenous Fluid (45 minutes)

• On medication orders, the physician specifies the rate of flow of intravenous fluids in milliliters

per minute, drops per minute, amount of drug(as milligrams per hour), or, more frequently, as the

approximate duration time of administration of the total volume of the infusion.

• Pharmacist may be called on to perform or check rate of flow calculations as those described in

the following example problems in this session

• Oftentimes, the following equation finds use in rate – of flow calculations

Rate of flow (drops/minute) == Volume infusion (mL) x Drip set Drops/m

Time (minutes)

• In common usage are macro sets that deriver 10, 15, or 20 drops per milliliter and micro drip or

mini drip sets that deriver 60 drops per milliliter

STEP 3: Performing Calculations Involving Rate of Flow of Intravenous Fluid

(60minutes)

Activity: Small Group Discussion (30 minutes)

DIVIDE students in small manageable groups

ASK students to discuss in groups on the following questions

• A medication order calls for 100mL of D5W to be administered over an 8-hour period.

Using an IV administration set that drivers 10 drops/mL, how many drops per minute

should be delivered to the patient?

REFER Students to Pharmaceutical Calculation. 13th Edition by HOWARD C.

ANSEL: Chapter 11, for reference

ALLOW students to discuss for 20 minutes

146

ALLOW each groups to present for 5 minutes

CLARIFY and SUMMARIZE by using the contents below

Volume of fluid = 1000mL

8hours = 480minutes

1000(mL) = 2.08 per minute

480(minutes)

2.08mL/min x 10 (drops/mL) = 20.8 or 21 drops per minutes

OR,

Solving by the equation:

Rate of flow (drop/min) = Volume infused (mL) x Drip set (drops/mL)

Time (min)

1000mL x 10drops/mL ==20.8 or 21drops per minutes

480minutes

STEP 4: Key Points (5 minutes)

• On medication orders, the physician specifies the rate of flow of intravenous fluids in milliliters

per minute, drops per minute, amount of drug(as milligrams per hour), or, more frequently, as the

approximate duration time of administration of the total volume of the infusion.

• Pharmacist may be called on to perform or check rate of flow calculations as those described in

the following example problems in this session

STEP 5: Evaluation (5 minutes)

• What is formula used to calculate rate of flow of intravenous fluids?

147

STEP 6: Take Home Assignment (15 minutes)

Activity: Take home Assignment (15 minutes)

ASK each individual student to do the following assignment

• Ten (10) milliliters of 10% calcium gluconate injection and 10 mL of multivitamin

infusion are mixed with 500mL of a 5% dextrose injection. The infusion is to be

administered over 5 hours. If the dropper in the venoclysis set calibrates 15drops/mL,

at what rate, in drops per minutes, should the flow be adjusted to administer the

infusion over the desired time interval?

ALLOCATE time for students to do the assignment and submit

REFER students to recommended references

148

References

Ansel, H. C &Stocklosa, M. J. (2001). Pharmaceutical Calculations (11th ed.). Philadelphia, United

States: LIPPINCOTT WILLIAMS & WILKINS

Ansel, H. C (2010) Pharmaceutical Calculations (13rd ed.). Philadelphia, United States:

LIPPINCOTT WILLIAMS & WILKINS

Senya, S. S, Mwasha, C.Y, Muyinga, A. M, Amiri,R. I. and Mauga E.A.S.K. (2011) Tanzania

Pharmaceutical Handbook (2nd ed.). Dar eS Salaam, Tanzania: School of Pharmaceutical

Sciences.

Zatz, J.L and Teixeira, M.G. (2005). Pharmaceutical Calculation (4th ed.). New Jersey: John Wiley

& Sons, Inc

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