ratio


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ratio

 [ra´she-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.
A/D ratio adult versus developmental toxicity ratio; the ratio between the toxic effects of a substance on adults (humans or animals, especially pregnant females) and such effects on developing embryos or fetuses.
A-G ratio (albumin-globulin ratio) the ratio of albumin to globulin in blood serum, plasma, cerebrospinal fluid, or urine.
arm ratio a figure expressing the relation of the length of the longer arm of a mitotic chromosome to that of the shorter arm.
benefit-risk ratio a determination of the potential of a research study for positive effects on patients compared to the risks of doing harm.
cardiothoracic ratio on a chest radiograph, the ratio of the transverse diameter of the heart to the internal diameter of the chest at its widest point just above the dome of the diaphragm.
grid ratio a ratio comparing the height of lead lines in an x-ray grid to the distance between the lead strips.
inspiratory-expiratory ratio the ratio of the inspiratory time to the expiratory time during the breathing cycle. Normally, expiratory time will be longer than inspiratory time; if the inspiratory time is longer than the expiratory time, gas trapping may result.
lecithin/sphingomyelin ratio see lecithin-sphingomyelin ratio.
risk ratio relative risk.
sex ratio the proportion of one sex to the other; by tradition the number of males in a population to the number of females, usually stated as the number of males per 100 females.
signal-to-noise ratio the ratio between the amplitude of a signal being measured and that of the noise.
urea excretion ratio the ratio of the amount of urea in the urine excreted in one hour to the amount in 100 ml of blood. The normal ratio is 50.
zeta sedimentation ratio (ZSR) a measurement comparable to the erythrocyte sedimentation rate, except that it is unaffected by anemia. The packed-cell volume (zetacrit) of a blood specimens is calculated by centrifuging the specimen in a Zetafuge, a specially designed instrument that produces controlled cycles of compaction and dispersion and allows rouleaux to form and sediment rapidly. The zetacrit divided into the true hematocrit gives the zeta sedimentation ratio.

ra·ti·o

(rā'shē-ō),
An expression of the relation of one quantity to another (for example, of a proportion or rate).
See also: index (2), quotient.
[L. ratio (ration-) a reckoning, reason, fr. reor, pp. ratus, to reckon, compute]

ratio

/ra·tio/ (ra´she-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.
A-G ratio , albumin-globulin ratio the ratio of albumin to globulin in blood serum, plasma, or urine in various renal diseases.
cardiothoracic ratio  on a radiograph, the ratio of the transverse diameter of the heart to the internal diameter of the chest at its widest point just above the dome of the diaphragm.
lecithin/sphingomyelin ratio , L/S ratio the ratio of lecithin to sphingomyelin concentration in the amniotic fluid, used to predict the degree of pulmonary maturity of the fetus and thus the risk of respiratory distress syndrome (RDS) if the fetus is delivered prematurely.
sex ratio  the proportion of one sex to another, traditionally the number of males in a population per number of females.
ventilation-perfusion ratio  the ratio of oxygen received in the pulmonary alveoli to the flow of blood through the alveolar capillaries.

ratio

[rā′shō]
Etymology: L, a reckoning
the relationship of one quantity to one or more other quantities, expressed as a proportion of one to the others and written either as a fraction (8/3) or linearly (8:3).

ratio

Vox populi The value obtained by dividing one quantity by another; a measure of association calculated by dividing one amount by another. See Abortion ratio, A/G ratio, A/P ratio, AT/GC ratio, Benefits-to-cost ratio, Branching ratio, Case-to-infection ratio, Case-fatality ratio, CD4/CD8 ratio, Cross-match/transfusion ratio, Death-to-case ratio, Duty ratio, Effective reproductive ratio, Exposure odds ratio, Flexor/extensor ratio, G:C ratio, HDL/LDL ratio, Helper:Suppressor ratio, HERT ratio, International Normalized ratio, Lecithin/sphingomyelin ratio, Likelihood ratio, Magnetization transfer ratio, Maternal mortality ratio, Medical loss ratio, Myeloid:Erythroid ratio, Nuclear:cytoplasmic ratio, Odds ratio, Packing ratio, Potency ratio, Prevalence ratio, Proportionate mortality ratio, Rate ratio, Signal-to-noise ratio, Reproduction ratio, Risk ratio, Sex ratio, Solubility ratio, Standardized mortality ratio, Thyroid hormone binding ratio, Urea reduction ratio, Waist-to-hip ratio.

ra·ti·o

(rā'shē-ō)
An expression of the relation of one quantity to another (e.g., of a proportion or rate).
See also: index (2) , quotient
[L. ratio (ration-) a reckoning, reason, fr. reor, pp. ratus, to reckon, compute]

ratio

index; calculated comparison of two events/factors, i.e. a/b ; ratio of <1 indicates b>a ; ratio of >1 indicates b<a ; where there is no difference, ratio = 1

ra·ti·o

(rā'shē-ō)
Expression of relation of one quantity to another (e.g., of a proportion or rate).
[L. ratio (ration-) a reckoning, reason, fr. reor, pp. ratus, to reckon, compute]

ratio,

n proportion; comparison.
ratio, A:G,
n the ratio of the protein albumin to globulin in the blood serum. On the basis of differential solubility with neutral salt solution, the normal values are 3.5 to 5 Gm% for albumin and 2.5 to 4 Gm% for globulin.
ratio, clinical crown: clinical root,
n the proportion of the length of the portion of the tooth lying coronal to the epithelial attachment to the length of the portion of the root lying apical to the epithelial attachment. Radiographically the clinical crown is the portion of the tooth coronal to the alveolar crest; the clinical root is the part of the root apical to the alveolar crest. The radiographic crown:root ratio is useful in the evaluation and prognosis of periodontal disease.
ratio, crown-implant,
n the proportional relationship between the height of the crown to the length of the implant that is surrounded by bone; the height of the crown is described as the length from the topmost point of the artificial crown to the point where the implant comes into contact with the bone.
ratio, grid,
n the relation of the height of the lead strips to the width of the nonopaque material between them. Common grid ratios are 2:8, 2:12, and 2:16.
ratio, water:powder,
n relative amounts of water and powder (usually gypsum products) in a mixture.

ratio

[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. It differs from a proportion in that the numerator is not included in the denominator. Thus x/(x + y) is a proportion, x:y is a ratio.

A-G ratio
albumin-globulin ratio.
area-incidence ratio
the number of new cases of a specific disease in a population during a specified time period, divided by the geographic area size in which the observations are made, multiplied by the time elapsed, e.g. cases per hectare per month.
arm ratio
a figure expressing the relation of the length of the longer arm of a mitotic chromosome to that of the shorter arm.
A/S ratio
the diameter of the ascending aorta divided by the diameter of the aorta at the sinus of Valsalva; less than 1 in a normal dog. In subaortic stenosis it becomes greater than 1.
cardiothoracic ratio
the ratio of the transverse diameter of the heart to the internal diameter of the chest at its widest point just anterior to the dome of the diaphragm.
cross ratio
see odds ratio.
fetal death ratio
the number of fetal deaths divided by the number of live births.
gain ratio
individual animal's gain/average gain in group × 100.
lecithin-sphingomyelin ratio
the ratio of lecithin to sphingomyelin in amniotic fluid. See also lecithin, sphingomyelin.
odds ratio
see odds ratio.
rates ratio
the ratio between two rates. See odds ratio and relative risk ratio (below).
relative risk ratio
the ratio between the rate (of mortality or some such parameter) in one group of animals and the rate in another group, used as a standard and the comparison expressed as a ratio. See also relative risk.
sex ratio
the number of males in a population per number of females, usually stated as the number of males per 100 females.
S/P ratio
secondary-to-primary ratio. An indicator of fleece type in sheep, the greater the ratio the finer the fleece. Coarse-wool sheep have ratios of 3:1 to 4:1; merinos have a ratio of 20:1.
stillbirth ratio
the ratio of stillbirths to total births in the population.
urea excretion ratio
the ratio of the amount of urea in the urine excreted in one hour to the amount in 100 ml of blood. The normal ratio is 50.

Patient discussion about ratio

Q. Q. I want to know about urine protein creatine ratio in diagnosing nephrotic syndrome. Please explain interms of unit such as mg/mg or mmol/mg. Normal range, nephrotic range with good referrence.

A. Nephrotic syndrome is defines as a damage to the kidneys, in which there is a leak of large amounts of protein (over 3.5 grams of protein / 24 hours urine output) from the blood to the urine. Protein loss causes low protein count in the blood (hypoalbuminemia) and edemas (excess fluid in the interstitial cavity which is between the cells, causes leg swelling most often, and also in the adbomen and around the eyes).

More discussions about ratio
References in classic literature ?
Hence we may confidently assert, that all plants and animals are tending to increase at a geometrical ratio, that all would most rapidly stock every station in which they could any how exist, and that the geometrical tendency to increase must be checked by destruction at some period of life.
But suppose a kind of social tabula rasa, every social unit perfectly equal, an increase of population everywhere in the same ratio, and give the same amount of land to each family; it would not be long before you would again have all the existing inequalities of fortune; it is glaringly evident, therefore, that there are such things as superiority of fortune, of thinking capacity, and of power, and we must make up our minds to this fact; but the masses will always regard rights that have been most honestly acquired as privileges, and as a wrong done to themselves.
That is to say, as the difference diminishes, the part of the difference which is not according to the laws of perspective diminishes much more rapidly, and bears to the total difference a ratio which tends towards zero as both are made smaller and smaller.
That exactly in the ratio as they worked long and monotonously, the craving grew within them for some physical relief - some relaxation, encouraging good humour and good spirits, and giving them a vent - some recognized holiday, though it were but for an honest dance to a stirring band of music - some occasional light pie in which even M'Choakumchild had no finger - which craving must and would be satisfied aright, or must and would inevitably go wrong, until the laws of the Creation were repealed?
Mr Clennam did not increase in favour with the Father of the Marshalsea in the ratio of his increasing visits.
In the matter of wills, personal qualities were subordinate to the great fundamental fact of blood; and to be determined in the distribution of your property by caprice, and not make your legacies bear a direct ratio to degrees of kinship, was a prospective disgrace that would have embittered her life.
Thus he found that the system of withholding the indispensable materials for production and subsistence from the laborers, except on condition of their supporting an idle class whilst accepting a lower standard of comfort for themselves than for that idle class, rendered the determination of just ratios of exchange, and consequently the practice of honest dealing, impossible.
Geometrical forms and arithmetical ratios furnish the laws according to which the world is created.
Flying Wedge features variable ratio, digital-readout temperature control to 300 F, vacuum degassing, positive-displacement metering, and output rates from 50 g to 50 lb/min.
For example, the worldwide human sex ratio ranges from 102 to 108 male births for every 100 female births; in other words, male babies make up about 50.
Tire aspect ratio is defined as tire section height divided by section width (figure 1).
Research has consistently supported that providing reading instruction at Gickling's proposed instructional ratio improved reading skills (Burns, 2002; Gickling & Rosenfield, 1995; Shapiro, 1992; Shapiro & Ager, 1992), but the instructional level for drill tasks was not derived from empiricism and data regarding instructional ratios for drill tasks have not been conclusive.