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9. Collecting Cerebrospinal Fluid

Doctors usually collect a cerebrospinal fluid sample to identify injury or illness using a lumbar puncture. The procedure requires the doctor to obtain one to ten mL of CSF by inserting a needle between the third and fourth lumbar vertebrae. The insertion enables to physician to evaluate the pressure of the CSF. High or low pressure can indicate a significant brain or spinal cord injury or disorder.

lumbar puncture vertebrae Jan-Otto / Getty Images

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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.