![]() In this position the bones of the lower back are flexed slightly to enlarge the openings between them, making it much easier for the needle to enter the spinal canal in the fewest number of attempts. In either position, the patient is bent forward at the waist with the knees tucked up toward the chest, and the head flexed forward with the chin toward the chest. The procedure can be performed with the patient sitting upright or lying on the side. Proper positioning of the patient on the procedure table is the most important factor in obtaining a sufficient sample without contamination. ![]() Not to worry, the average nervous system contains about 120 mL of CSF, and the brain is constantly replenishing and reabsorbing it at a rate of about 500 mL a day. The amount of sample needed in a typical lumbar puncture is between about 10-30 mL of CSF. Inflammatory and autoimmune conditions like Multiple Sclerosis, Guillain Barre syndrome, and brain vasculitis.Infections like meningitis, encephalitis, and brain abscess.Certain medical conditions can cause abnormalities in the CSF that can be detected through laboratory testing.Ĭonditions where an LP can aid in the diagnosis: It is composed primarily of water, glucose (sugar), and protein. This procedure is performed to obtain a sample of cerebrospinal fluid (CSF) for laboratory testing.ĬSF is the fluid that bathes the brain and spinal cord and helps to protect it from trauma or injury. An LP is sometimes referred to as a “spinal tap,” and is done by inserting a needle in between the bones of the lower back (the “lumbar” region) and into the spinal canal. The lumbar puncture (LP) is a procedure that is performed by a physician to aid in the diagnosis of certain medical conditions.
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