Skip to Main Content

Veterinary Nursing Key Mathematical Concepts: Fluid Therapy

Apply key mathematical concepts to successfully complete routine calculations required by veterinary nurses

Handy Formulae

Fluid rate =  Total volume to be given (ml)
  Time (hr)
Minute rate = hourly rate  ÷ 60
Drops per minute = minute rate x giving set drip factor
Drops/second = drops/minute ÷ 60

Brown, R 2012, Week 4 BVN111 Mathematical concepts, modified Meg Dietze, Theory notes, NMIT, Melbourne, VIC.

For small animals: Maintenance requirement = 40-60ml/kg/d
Very small animals will require 60ml/kg/d while large dogs will be closer to 40ml/kg/d.
Calculation of Fluid Requirements for a Patient - including ongoing Maintenance and to Replace Dehydration
Calculate the amount of fluid lost (ml).
This is done using the conversion of 1kg = 1 litre of fluid. 
Calculate the maintenance requirement (ml) - based on the standard of 40-60ml/kg/d
Calculate the total amount of fluid required to be given (ml) = amount of fluid lost + maintenance requirements
Determine the number of hours over which the fluid is to be given (the vet will usually tell you this)
Calculate the amount of fluid to be administered per hour

Webpages & online articles

Australian College of Veterinary Nursing article:

Today's Veterinary Nurse articles:

The Veterinary Nurse article:

Other articles/webpages:

Videos: Fluid Therapy

Library Resources

ARTICLES:

A series of articles from In Practice, published by the British Veterinary Association:

Goggs, R., Humm, K., & Hughes, D. (2008). Fluid therapy in small animals 1. Principles and patient assessment. In Practice, 30(1), 16–35.

Humm, K., Goggs, R., & Hughes, D. (2008). Fluid therapy in small animals 2. Crystalloid solutions. In Practice, 30(2), 85–91.

Goggs, R., Humm, K., & Hughes, D. (2008). Fluid therapy in small animals 3. Colloid solutions. In Practice, 30(3), 136–159.

EBOOK:

Di Bartola, S.P. (2012). Fluid, electrolyte, and acid-base disorders in small animal practice (4th ed). Saunders. 

See Section IV. Fluid Therapy

VIDEOS:

Videos by Animal Care Technologies (ACT) on Veterinary Education in Video

PRINT BOOK: