lumbar puncture
US /ˈlʌm.bɑːr ˌpʌŋk.tʃər/
UK /ˈlʌm.bɑːr ˌpʌŋk.tʃər/
1.
a medical procedure in which a needle is inserted into the lower part of the spinal canal to collect cerebrospinal fluid for diagnostic purposes or to administer medication
:
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The doctor performed a lumbar puncture to test for meningitis.
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A lumbar puncture can help diagnose various neurological conditions.