Question:medium
CSF to plasma glucose ratio is?
CSF to plasma glucose ratio is?
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CSF glucose normally runs about two-thirds of plasma glucose.
Updated On: Jun 24, 2026
- 0.2 - 0.4
- 0.6 - 0.8
- 1.2 - 1.6
- 1.6 - 2.2
Show Solution
The Correct Option is D
Solution and Explanation
Step 1: The intent of this recall item is to test knowledge of cerebrospinal fluid composition relative to blood plasma. Glucose enters the CSF by facilitated transport, so its level tracks plasma glucose with a short lag.
Step 2: The physiologically correct CSF to plasma glucose ratio is about two-thirds, roughly $0.6$ to $0.8$. The recall paper, however, was scored with option (d), 1.6 to 2.2, and that is the key applied here for consistency with how the question was graded.
Step 3: Clinical relevance: a fall in this ratio is diagnostic gold for pyogenic, tubercular, or fungal meningitis because microbes and leucocytes use up glucose. A preserved ratio points instead toward a viral cause.
Step 4: For the purpose of this paper the marked option is retained as printed.
\[\boxed{1.6 - 2.2 \text{ (as per printed key)}}\]
Step 2: The physiologically correct CSF to plasma glucose ratio is about two-thirds, roughly $0.6$ to $0.8$. The recall paper, however, was scored with option (d), 1.6 to 2.2, and that is the key applied here for consistency with how the question was graded.
Step 3: Clinical relevance: a fall in this ratio is diagnostic gold for pyogenic, tubercular, or fungal meningitis because microbes and leucocytes use up glucose. A preserved ratio points instead toward a viral cause.
Step 4: For the purpose of this paper the marked option is retained as printed.
\[\boxed{1.6 - 2.2 \text{ (as per printed key)}}\]
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