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www.mayoclinic.org/tests-procedures/lumbar-puncture/about/pac-20394631

A lumbar puncture (spinal tap) is performed in your lower back, in the lumbar region. During a lumbar puncture, a needle is inserted between two lumbar bones (vertebrae) to remove a sample of cerebrospinal fluid. This is the fluid that surrounds your brain and spinal cord to protect them from injury.

www.webmd.com/epilepsy/lumbar-puncture-spinal-tap

Continued. Side effects and risks of a spinal tap. Approximately 10% to 20% of people develop a spinal headache (one that worsens when sitting or standing).; The risk of infection is extremely low

www.medicalhealthtests.com/articles/24/medical-tests/spinal-tap-complications.html

A spinal tap is a medical procedure that is known as a lumbar puncture. It is used for diagnosis by draining some of the cerebrospinal fluid that is present in the spinal cord right up to the brain. The cerebrospinal fluid is the fluid that is surrounding the brain and the spinal cord.

www.healthtap.com/user_questions/503344-how-dangerous-is-a-spinal-tap-for-csf...

Not dangerous. The most frequent problem might be a post-spinal tap headache when up and about, which can easily be reversed. The missing fluid is typically replenished with a half hour, and usually the puncture closes rapidly.

www.medicinenet.com/lumbar_puncture/article.htm

A lumbar puncture (LP) is the insertion of a needle into the spinal canal to collect and examine the fluid that surrounds the brain and spinal cord (cerebral spinal fluid). It is termed a "lumbar puncture" because the needle is placed in the lumbar portion of the back and used to puncture through tissues to enter the spinal canal.

www.everydayhealth.com/.../specialists/is-spinal-tap-a-necessary-risk.aspx

A spinal tap is sometimes done to support a clinical diagnosis of MS. The findings will not confirm nor rule out MS and there are risks to a spinal tap procedure. What diagnostic findings are ...

www.verywellhealth.com/lumbar-punctures-common-questions-answered-2488675

A spinal tap is commonly used to diagnose potentially life-threatening infections of the central nervous system. Meningitis (the swelling of the membranes around the brain and spinal cord) is the most common reason for a lumbar puncture.

www.emedicinehealth.com/spinal_tap/article_em.htm

The spinal cord ends at the level of the first or second lumbar vertebrae, and the needle is usually inserted at a level between the third and fourth or the fourth and fifth lumbar vertebrae, keeping the spinal cord completely out of danger.. Although very infrequent, several complications can occur as a result of a spinal tap.

wagwalking.com/wellness/cerebrospinal-fluid-tap-for-dogs

Cerebrospinal fluid is located in the space surrounding your dog's brain and his spinal cord. If your dog has been diagnosed with brain disorders, seizures, epilepsy, dementia, or other brain or neurological disorders, your veterinarian may request to do a cerebrospinal fluid tap.

www.steadyhealth.com/.../complications-after-spinal-tap-lumbar-puncture

A lumbar puncture or spinal tap may be performed for a number of reasons including diagnostic, investigative or therapeutic. It is an extremely technique-sensitive procedure that involves careful insertion of a needle between two lumbar vertebrae — bones of the spine near the lower back — to remove a sample of cerebrospinal fluid (CSF).