Certification of Pharmacy Technicians (ExCPT) Practice Exam

What type of solution is Lactated Ringer's?

1. Acidic

2. Hypertonic

3. Hypotonic

4. Isotonic

The correct answer is: Isotonic

Lactated Ringer's solution is classified as an isotonic solution. This means that it has a similar osmolarity to that of the bodily fluids and cells, which helps to maintain cell integrity and fluid balance without causing cells to swell or shrink. Isotonic solutions are often used in medical settings for fluid replacement and to correct electrolyte imbalances. Lactated Ringer's solution contains a balanced mixture of electrolytes that closely resembles the composition of plasma, making it effective for intravenous rehydration. Its isotonic property is crucial in preventing osmotic pressure changes that can adversely affect red blood cells and other cellular components. This characteristic of being isotonic ensures that when administered, it will effectively distribute the fluids into the extracellular space while maintaining the osmotic balance necessary for physiological functions.