- ratio
- An
*expression*of the*relation*of one quantity to another ( e.g., of a proportion or rate). SEE ALSO:*index*(2),*quotient*. [L. r. (ration-) a reckoning, reason, fr. reor, pp. ratus, to reckon, compute]-the*absolute**terminal**innervation*r.*number*of*motor*endplates divided by the*number*of*terminal*axons related to them.-(*accommodative*convergence-*accommodation*r.*AC/A*) the amount of*convergence*(measured in*prism*diopters of*convergence*) divided by the amount of*accommodation*(measured in diopters) required to direct both eyes upon an*object*.-**A/G r.**abbreviation for albumin-*globulin*r..-**albumin-**(A/G r.) the r. of*globulin*r.*albumin*to*globulin*in the*serum*or in the*urine*in*kidney**disease*; the*normal*r. in the*serum*is approximately 1.55.-**ALT:AST r.**the r. of*serum**alanine aminotransferase*to*serum**aspartate*aminotransferase; elevated*serum*levels of both enzymes characterize*hepatic**disease*; when both levels are abnormally elevated and the ALT:AST r. is greater than 1.0, severe*hepatic**necrosis*or*alcoholic**hepatic**disease*is likely; when the r. is less than 1.0, an*acute*nonalcoholic*hepatic**condition*is favored.-**amylase-**a*creatinine**clearance*r.*test*for the*diagnosis*of*acute**pancreatitis*; it is determined by measuring*amylase*and*creatinine*in*serum*and*urine*; in apparently*healthy*individuals the*renal**clearance*of*amylase*is less than 5% that of*creatinine*; in*acute**pancreatitis*the r. is said to be greater than 5%.-**cardiothoracic r.**the r. of the horizontal*diameter*of the*heart*to the inner*diameter*of the rib*cage*at its widest*point*as determined on a*chest**roentgenogram*.-**r. of decayed and filled surfaces**(*RDFS*) an*index*of decayed and filled permanent surfaces per person, per full*complement*of 122*tooth*surfaces.-**r. of decayed and filled**(*teeth**RDFT*) an*index*of decayed and filled permanent*teeth*per person, per full*complement*of 28*teeth*.-(E) the*extraction*r.*fraction*of a*substance*removed from the*blood*flowing through the*kidney*; it is calculated from the*formula*(A —V)/A, where*A*and*V*, respectively, are the concentrations of the*substance*in*arterial*and*renal**venous**plasma*.-a*fertility*r.*measure*of the*fertility*of a*population*based on the*female**population*in the child-bearing age*group*, defined as ages 15–49 years.-the*functional**terminal**innervation*r.*number*of*muscle*fibers divided by the*number*of axons that innervate them.-in a radiographic scatter-absorbing*grid*r.*grid*, the r. of the*height*to the*width*of the gaps between*lead*strips; a higher*grid*r. removes more scattered*radiation*but requires more careful*x-ray**tube*positioning to avoid*grid*cutoff of the*primary**radiation**beam*.-**gyromagnetic r.**in*nuclear**magnetic**resonance*, the r. of the*magnetic**dipole**moment*of the*nucleus*to the*nuclear*spin angular momentum; the gyromagnetic r. is a unique*value*for each*type*of*nucleus*. SYN: magnetogyric r..-the r. of the*hand*r.*length*of the*hand*(measured on the*dorsum*from the*styloid**process*of the*ulna*to the tip of the third*finger*) to the*width*across the knuckles.-**international normalized r.**(INR) the*prothrombin**time*r. that would have been obtained if a*standard**reagent*had been used in a*prothrombin**time**determination*; the*prothrombin**time*r. is expressed as the*patient**prothrombin**time*divided by the*mean*of the*prothrombin**time*reference*interval*; the*prothrombin**time*r. is obtained for a working*reagent*in the*laboratory*through use of a*parameter*designated the international*sensitivity**index*. SEE ALSO: international*sensitivity*index.-**IRI/G r.**the r. of*immunoreactive**insulin*to*serum*or*plasma*glucose; in*hypoglycemic*states a r. of less than 0.3 is usual, with the exception of the*hypoglycemia*due to*insulinoma*, where the r. is often higher than 0.3.-**K:A r.**abbreviation for ketogenic-*antiketogenic*r..-**ketogenic-**(K:A r.) the proportion between substances that*antiketogenic*r.*form*ketones in the*body*and those that*form**d-glucose*.-**lecithin/sphingomyelin r.**(L/S r.) a r. used to determine*fetal**pulmonary**maturity*, found by*testing*the*amniotic**fluid*; when the lungs are*mature*,*lecithin*exceeds sphingomyelin by 2 to 1.-**L/S r.**abbreviation for lecithin/sphingomyelin r..-**magnetogyric r.**(mag′ne-to-gy-rik) SYN: gyromagnetic r..-**mass-**the r. of the*action*r.*product*of all of the*product*concentrations divided by the*product*of all of the*reactant*concentrations of a particular*reaction*; when the*reaction*has been completed ( i.e.,*t*= ∞), then this r. is equal to the*equilibrium**constant*.-**M:E r.**the r. of*myeloid*to*erythroid*precursors in*bone**marrow*; normally it varies from 2:1 to 4:1; an increased r. is found in infections,*chronic**myelogenous**leukemia*, or*erythroid**hypoplasia*; a decreased r. may*mean*a*depression*of*leukopoiesis*or normoblastic*hyperplasia*depending on the overall*cellularity*of the*bone**marrow*.-the r. of*mendelian*r.*progeny*with particular phenotypes or genotypes*expected*in accordance with*Mendel*law among the offspring of matings specified as to*genotype*or*phenotype*.-**nuclear-**r. of*cytoplasmic*r.*volume*of*nucleus*to*volume*of*cytoplasm*, fairly*constant*for a particular*cell**type*and usually increased in*malignant*neoplasms.-**nucleolar-**r. of*nuclear*r.*volume*of*nucleolus*to*volume*of*nucleus*, usually increased in*malignant*neoplasms.-**P/O r.**a*measure*of*oxidative**phosphorylation*; the r. of*phosphate*radicals esterified (forming*adenosine 5′-triphosphate*from*adenosine 5′-diphosphate*) to atoms of*oxygen*consumed by*mitochondria*; normally, the r. is 3 (starting from NADH). SYN: P/O quotient.-the r. of the net*respiratory**exchange*r.*output*of*carbon**dioxide*to the simultaneous net*uptake*of*oxygen*at a given*site*, both expressed as moles or*STPD*volumes per*unit**time*; in the steady*state*,*respiratory**exchange*r. is equal to the*respiratory**quotient*of*metabolic*processes.-in*segregation*r.*genetics*, the proportion of*progeny*of a particular*genotype*or*phenotype*from actual matings of specified genotypes. The*test*of a*mendelian**hypothesis*is the comparison of the*segregation*rate with the*mendelian*rate.-**sex r.****1.**the r. of*male*to*female**progeny*at some specified*stage*of the*life**cycle*, notably at*conception*(primary), at*birth*(secondary), or at any*stage*between*birth*and*death*(tertiary);**2.**the r. of the numbers of males to females affected by a particular*disease*or*trait*.-**signal-to-**the relative*noise*r.*intensity*of a*signal*to the*random**variation*in*signal**intensity*, or*noise*; used to evaluate many*imaging*techniques and*electronic*systems.-**standardized**the r. of the*mortality*r.*number*of events observed in a*population*to the*number*that would be*expected*if the*population*had the same*distribution*as a*standard*or reference*population*.-**systolic/diastolic r.**a calculation from pulsed*Doppler**ultrasound*determinations of*blood**flow*velocities that reflects*intrinsic**resistance*in an*arterial**blood vessel*.-the r. of the maximally tolerated*therapeutic*r.*dose*of a*drug*to the minimal*curative*or effective*dose*; LD_{50}divided by*ED*._{50}-(F) the*variance*r.*distribution*of the r. of two independent estimates of the same*variance*from a*gaussian**distribution*based on samples of sizes (*n*+ 1) and (m + 1), respectively. Estimates are usually based on one such*sample*analyzed in such a way as to make them independent, e.g.,*analysis*of*variance*, and F may be used to*test*a null*hypothesis*that the observed differences among*sample*means is no greater than could readily be accounted for by chance.-**ventilation/perfusion r.**(*Va/Q*) the r. of*alveolar**ventilation*to simultaneous*alveolar**capillary**blood**flow*in any*part*of the*lung*; because both*ventilation*and*perfusion*are expressed per*unit**volume*of*tissue*and per*unit**time*, which cancel, the units become liters of gas per*liter*of*blood*.-**waist-hip r.**r. of the*abdominal**circumference*at the*navel*to*maximum*hip and*buttocks**circumference*.-(ZSR) the r. of the*zeta**sedimentation*r.*zetacrit*to the*hematocrit*, normally 0.41–0.54 (41–54%); it is a*sensitive**indicator*of the*erythrocyte**sedimentation**rate*(ESR) and, unlike the latter, is unaffected by*anemia*, which tends to elevate the ESR.* * *

**ra·tio 'rā-(.)shō, -shē-.ō***n*,*pl***ra·tios**the relationship in quantity, amount, or size between two or more things*see***SEX RATIO*** * *

ra·tio (raґshe-o) [L.] an expression of the quantity of one substance or entity in relation to that of another; the relationship between two quantities expressed as the quotient of one divided by the other.

*Medical dictionary.
2011.*

**Synonyms**:

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**ratio**— ratio … Dictionnaire des rimes**RATIO**— Rechtsform GmbH Co. KG Gründung 1774 Sitz Münster … Deutsch Wikipedia**RATIO**— RATI Pour suivre l’évolution de la situation financière d’une entreprise, l’examen du bilan doit être complété par l’étude et l’appréciation des rapports existant entre différents postes ou groupes de postes. Cette procédure entre dans ce que… … Encyclopédie Universelle**Ratio**— ist ein lateinischer Begriff und wird häufig mit Vernunft oder Verstand übersetzt. In der Mathematik dagegen bedeutet das Wort meist „Verhältnis“ beziehungsweise „Quotient“ und weist darauf hin, dass eine Größe zu einer anderen in Beziehung… … Deutsch Wikipedia**Ratio**— Ra ti*o (r[=a] sh[i^]*[ o] or r[=a] sh[ o]), n. [L., fr. reri, ratus, to reckon, believe, think, judge. See {Reason}.] 1. (Math.) The relation which one quantity or magnitude has to another of the same kind. It is expressed by the quotient of the … The Collaborative International Dictionary of English**ratio**— (izg. rȁcio) m DEFINICIJA fil. sposobnost poimanja, logičkog mišljenja, zaključivanja i rasuđivanja; um, razum, pamet, razbor SINTAGMA ratio iuris (izg. ratio jȗris) pravn. logika pravnoga sustava; ratio legis (izg. ratio lȇgis) pravn. smisao… … Hrvatski jezični portal**Ratio**— * Ratio status in Acht nehmen. »Es scheint, er wisse nicht, dass heutiges Tages auch in den Heurathen ratio status wie in allem, in Acht genommen werde.« (Köhler, 15, 12.) Ratio status, ragione del stato, raison d etat, die Staatssaison, der… … Deutsches Sprichwörter-Lexikon**RATIO**— (лат.) разум, рассудок, основание, причина, довод, смысл, способ, мотив. Философский энциклопедический словарь. М.: Советская энциклопедия. Гл. редакция: Л. Ф. Ильичёв, П. Н. Федосеев, С. М. Ковалёв, В. Г. Панов. 1983 … Философская энциклопедия**ratio**— /lat. ˈrattsjo/ [vc. lat., lett. «ragione»] s. f. inv. ragione, motivo, principio FRASEOLOGIA extrema ratio, ultima ratio, ultimo rimedio praticabile, ultima possibilità □ ratio legis (dir.), ragione ispiratrice e scopo di una norma … Sinonimi e Contrari. Terza edizione**Ratio**— Ratio: Der bildungssprachliche Ausdruck für »Vernunft, Einsicht, Denk , Urteilsvermögen« wurde im 16. Jh. aus lat. ratio »Rechnung, Berechnung; Erwägung, Überlegung; Vernunft, Denkvermögen« (vgl. ↑ Rate) übernommen. Von lat. ratio abgeleitet ist… … Das Herkunftswörterbuch**Ratio**— Ratio,die:⇨Vernunft(1) Ratio 1.→Vernunft 2.→Verstand … Das Wörterbuch der Synonyme