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 The current ratio is calculated by taking total current assets and dividing by total current liabilities. The ratio is an indication of a firm's market liquidity and ability to meet creditor's demands.  Acceptable current ratios vary from industry to industry and are generally between 1.5% and 3% for healthy businesses.