Normal volume of CSF in adult is-

Appeared in: RUHS, Jaipur, PB B.Sc Nursing Entrance-2024

Explanation

125-150 ml, which represents the standard circulating volume of cerebrospinal fluid (CSF) in a healthy adult.
Although the body produces a large amount of CSF daily (around 500 ml), the processes of circulation and absorption maintain this relatively small, constant volume at any given time.
This volume is sufficient to perform CSF's primary functions, including cushioning the brain and spinal cord, providing nutrients, and removing waste products.
Textbook sources confirm the normal adult volume is around 150 ml, with a common reference range being 120-150 ml or 125-150 ml.

Option A: This range is too broad. While the upper limit of 150 ml is correct, the lower limit of 80 ml is below the generally accepted normal value for an adult.
Option C: This volume is significantly too low for an adult. A volume of 60-80 ml is more typical for a child.
Option D: This volume is pathologically high. A CSF volume of 200-300 ml indicates an abnormal accumulation of fluid.

Clinical Relevance

Nursing practice connection: Knowing Normal cerebrospinal fluid (CSF) volume in adults helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Understanding normal CSF volume is crucial for interpreting findings from a lumbar puncture (spinal tap) and diagnosing neurological conditions.
An increase in CSF volume and pressure can indicate hydrocephalus, infection (meningitis), or bleeding, requiring urgent medical intervention.
A decrease in CSF volume can occur due to a CSF leak after trauma or a lumbar puncture, leading to severe postural headaches.

How to Approach the Question

First, identify the core of the question, which is asking for a specific physiological value: the normal volume of CSF in an adult.
This is a factual recall question. Access your knowledge of normal human physiology.
Evaluate the given options. Notice that they present different numerical ranges.
Recall or deduce the standard range. The adult brain and spinal cord system holds a relatively small amount of fluid at any one time, despite high daily production.
Eliminate options that are clearly too low (pediatric range) or too high (pathological range).
Select the option that most closely matches the established normal physiological range, which is 125-150 ml.

Concept Tested & Keywords

QKe6KvINxZzBV9tQnOXei3

E6 Biochemistry U Satyanarayana— Part 2 (pp 421-820 of 840) p. 121-123

E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 1383-1385

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