Lumbar puncture. 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.
2. ratio-the relation between things (or parts of things) with respect to their comparative quantity, magnitude, or degree; an inordinate proportion of the book is given over to quotations; a dry martini has a large proportion of gin. proportion.
1 NOTES:A ratio is a relationship between two quantities. 2  Aratio can be written as A:B, A/B or by the phraseâA to Bâ.Per (mph, $/item, grade/class,)This can be part to whole or Part to Part.( 3 P/W orP/P)Looks like a Fraction (but not always!) only in Partto whole. 4. PART TO WHOLE RELATIONSHIPThere are men and woman in a meeting. 2  If the ratio ofwoman to people in a room is 3 to 5 and there are 40people in the room, how many women are in the room?