Programme: Diploma Nursing
Subject/Course Unit: Medical Nursing I
Topic: Fluid and Electrolyte Balance
Learning objectives
- Explain the importance of fluid and electrolyte balance.
- Recognize common signs of fluid deficit and excess.
- Identify nursing observations used to assess fluid status.
Study lesson
Body fluids support circulation, cellular function, temperature regulation and waste elimination. Nurses monitor fluid status using history, intake and output, vital signs, weight, urine output, mucous membranes, oedema and other clinical findings.
Fluid deficit
Possible findings include thirst, dry mucous membranes, reduced urine output, weakness and postural symptoms. The cause and severity must be assessed.
Fluid excess
Possible findings include oedema, rapid weight gain and respiratory symptoms. Assessment and timely reporting are important.
Important electrolytes
Sodium and potassium are major electrolytes involved in fluid balance, nerve function and muscle activity.
Watch and learn
OpenStax fluid and electrolyte reference
Interactive MCQs
1. Which finding is most consistent with fluid deficit?
A. Dry mucous membranes
B. Generalized oedema
C. Rapid fluid weight gain
D. Pulmonary congestion
Answer: A
2. Which electrolyte is especially important for normal nerve and muscle function?
A. Potassium
B. Oxygen
C. Glucose
D. Albumin
Answer: A
3. Why is accurate intake and output documentation important?
A. It helps monitor fluid trends and supports clinical decisions.
B. It replaces physical assessment.
C. It prevents every cause of fluid imbalance.
D. It eliminates the need to monitor vital signs.
Answer: A
Revision
Assess fluid status systematically, measure intake and output accurately, monitor trends and report concerning changes promptly.
Programme note: This lesson is specifically for Diploma Nursing. It should only be shared with another programme when the curriculum identifies the same competency or learning outcome.
Disclaimer: This lesson supports learning and does not replace approved curriculum documents, institutional teaching, clinical supervision or professional guidance.