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.
WHAT IS RATIO ANALYSIS. Ratio analysis is the application of ratios in comparing similar variables. Ratio analysis is the process of systematically manipulating figures from the fiancial statements of a company to produce information that are used as part of investment decision making process.