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.
A ratio is a set of numbers, each of which represents the proportion or size of a variable with respect to the other values. For example, a ratio of 3:2 means that for every â¦ 3 parts of the first variable, there are two of the second. 6:4 is the same ration as 3:2, as are all other multiples of these numbers. A unit ratio is a ratio scaled down so that the lower value is 1. The above example of 3:2 would become 1.5:1.A ratio of 9:6:2 would become 4.5:3:1. 8 people found this useful. 1  College Admission Interview Dos and Don'ts Some colleges offer applicants the opportunity to interview on campus or close to home.A unit ratio is a ratio scaled down so that the lower value is 1. The above example of 3:2 would become 1.5:1. A ratio of 9:6:2 would become 4.5:3:1. 8 people found this useful. 1  College Admission Interview Dos and Don'ts Some colleges offer applicants the opportunity to interview on campus or close to home.