what will happen during a lumbar puncture

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Dr. Mark A. Fisher answered:

What will happen during a lumbar puncture?

Lumbar puncture (LP)

Central_nervous_system
Cerebrospinal fluid (CSF) bathes brain & spinal cord (CNS). CSF may be abnormal in some diseases. In an LP, you are either on your side or sitting. MD feels lower back for interspace between 4th & 5th lumbar vertebrae, below end of CNS. Lidocaine is injected. 3” hollow needle is inserted thru interspace & into sac holding CNS & CSF. MD collects CSF (usually ~1 tsp) into 3-4 tubes. CSF sent to lab.
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How much cerebro spinal fluid is removed during lumbar puncture ?

3-5 cc

Lumbar_puncture
Usually routine analysis necessitates between 3 to 5 cc. This is about half a teaspoon to one teaspoon. Some conditions necessitate removing 2 teaspoons and in rare conditions such as hydrocephalus, 20-30 cc may be removed.
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Dr. Janice Wiesman answered:

About how much cerebro spinal fluid is removed during a diagnostic lumbar puncture ?

Small amount

Lumbar
Typically 1 to 2 tablespoons. If fluid needs to be sent for cytology - looking for abnormal cells, then more fluid is needed. You produce the fluid continuously and whatever fluid is taken out is rapidly replaced.
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What should normal inter crainal pressure be during my last lumbar puncture my beginning pressure was 38 I was just wondering I also HA e iih?

Positional

Pseudotumor_cerebri
In the side-lying position intracranial pressure as measured during lumbar puncture should be between 100 and 150 cm of water pressure. If pressure is measured while sitting upright, pressure level in fluid column should extend to base of skull (foramen magnum) but numerically will exceed 150. The rest of your question is unclear. Are you asking about a post-spinal headache?
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What happens if a lumbar puncture is done too high?

May hit cord

Lumbar
Doing an LP too high up in the back risks hitting the spinal cord, which can damage the cord. It is best to do an LP below the level where the actual spinal cord ends since the needle is designed to slide by nerve roots.
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Dr. Leila Wing answered:

lumbar puncture?

What is the question

Lumbar
What is your question about lumbar puncture? It is a procedure to get spinal fluid out of the spinal column to investigate for infection, protein, blood and other tests. Can be done to evaluate for meningitis, brain hemorrhage, multiple sclerosis.
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What is a lumbar puncture?

Diagnostic test

Lumbar
A lumbar puncture is a test where a needle is inserted into the spinal canal to draw out a small amount of cerebral spinal fluid for diagnostic testing purposes, such as diagnosing meningitis.
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Whats a lumbar puncture likes?

Bee sting

Lumbar_puncture
The worst part of the lumbar puncture is the bee sting when you get local anesthesia injected. After that you should just feel some pressure in your back and not too much pain.
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How is lumbar puncture performed?

Carefully :)

Lumbar
LP is typically performed in the office. You will lie on your side curled up into a tight ball. After sterilizing the area, local anesthetic is injected into the skin at the small of the back, and then a spinal needle is advanced between the vertebrae into the spinal canal. Once in the canal, the fluid pressure is measured and fluid is removed for analysis. Total time is typically 20 mins.
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Dr. Atif Haque answered:

Can a lumbar puncture paralyze me?

Rarely

Blood
I have seen this happen twice in the span of my medical career, both instances in which the performing physician was not aware of the patients' use of blood thinners. Hematomas formed and extended upward from the "safe" levels of lumbar puncture up to the spinal cord.
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