C.S.F. is required to be preserved in :
**Core Concept**
The preservation of cerebrospinal fluid (CSF) is crucial in laboratory settings to maintain its integrity and prevent degradation of its components, which are vital for diagnostic purposes. CSF is a clear, colorless body fluid that circulates between the brain and spinal cord, playing a key role in shock absorption, immune function, and waste removal.
**Why the Correct Answer is Right**
CSF must be preserved in a manner that prevents bacterial growth, enzymatic degradation, and contamination. The correct answer is a type of preservative that prevents bacterial growth by inhibiting the action of microbial enzymes. The use of this preservative ensures that the CSF remains viable for analysis, allowing for accurate diagnosis of various neurological conditions. The preservative works by inhibiting the action of bacterial enzymes, thereby preventing the breakdown of CSF components.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not provide a suitable environment for preserving CSF. The pH of this option may not be optimal for preserving CSF, leading to degradation of its components.
**Option B:** This option is incorrect as it may cause contamination of the CSF, leading to inaccurate results. The presence of bacteria in this option can lead to the breakdown of CSF components, rendering it unsuitable for analysis.
**Option C:** This option is incorrect as it may not provide sufficient protection against enzymatic degradation. The lack of a suitable preservative in this option can lead to the breakdown of CSF components, making it unsuitable for analysis.
**Clinical Pearl / High-Yield Fact**
CSF is a dynamic fluid that is constantly being produced and absorbed by the brain and spinal cord. The production and absorption of CSF are tightly regulated, and any disruption to this process can lead to various neurological conditions, including hydrocephalus and meningitis.
**Correct Answer:** B. EDTA (Ethylenediaminetetraacetic acid) is a chelating agent that inhibits the action of bacterial enzymes, making it an ideal preservative for CSF.