<P> Lumbar puncture ( LP ) , also known as a spinal tap , is a medical procedure in which a needle is inserted into the spinal canal , most commonly to collect cerebrospinal fluid ( CSF ) for diagnostic testing . The main reason for a lumbar puncture is to help diagnose diseases of the central nervous system , including the brain and spine . Examples of these conditions include meningitis and subarachnoid hemorrhage . It may also be used therapeutically in some conditions . Increased intracranial pressure ( pressure in the skull ) is a contraindication , due to risk of brain matter being compressed and pushed toward the spine . Sometimes , lumbar puncture can not be performed safely ( for example due to a severe bleeding tendency ) . It is regarded as a safe procedure , but post-dural - puncture headache is a common side effect . </P>
<P> Lumbar puncture ( LP ) , also known as a spinal tap , is a medical procedure in which a needle is inserted into the spinal canal , most commonly to collect cerebrospinal fluid ( CSF ) for diagnostic testing . The main reason for a lumbar puncture is to help diagnose diseases of the central nervous system , including the brain and spine . Examples of these conditions include meningitis and subarachnoid hemorrhage . It may also be used therapeutically in some conditions . Increased intracranial pressure ( pressure in the skull ) is a contraindication , due to risk of brain matter being compressed and pushed toward the spine . Sometimes , lumbar puncture can not be performed safely ( for example due to a severe bleeding tendency ) . It is regarded as a safe procedure , but post-dural - puncture headache is a common side effect . </P>
where does the needle go for a spinal tap
where does the needle go for a spinal tap
into the spinal canal
into the spinal canal