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.
â Tells the ratio of products formed from the reactants. (MOLE RATIO) Mole ratio: a ratio between the number of moles of any two substances in a chemical reaction. Atoms and molecules are incredibly small and impossible to count. We use moles to compare the quantity of reactants to products.