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 actually the same as a fraction. It expresses the relationship between one part of the whole and the whole. The two numbers of a ratio are separated by a colon, just as the two numbers in a fraction are divided by a fraction bar. Ratio to Fraction Calculator is an online tool to change ratio into fraction.Ratio to Fraction Calculator is a tool which makes calculations easy and fun. When reading a ratio, the colon (:) or fraction bar (-) is read as is to or per.he two numbers of a ratio are separated by a colon, just as the two numbers in a fraction are divided by a fraction bar. Ratio to Fraction Calculator is an online tool to change ratio into fraction. Ratio to Fraction Calculator is a tool which makes calculations easy and fun.