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.
Ratio/s â Refer to relationship of one amount to another. Ratios give the relative or differing sizes, often expressed as the number of times one variable is contained or related to another. The following is a table of some of the more common ratios used in most entry level business and accounting courses. Liquidity: