- A particular quantitative determination. For values not given below, see the specific name. SEE ALSO: index, number. [M.E., fr. O.Fr., fr. L. valeo, to be of v.]- acetyl v. the milligrams of KOH required to neutralize the acetic acid produced by the hydrolysis of 1 g of acetylated fat; a measure of the hydroxy acid s present in glycerides; notably high in castor oil.- buffer v. the power of a substance in solution to absorb acid or alkali without change in pH; this is highest at a pH v. equal to the pKa v. of the acid of the buffer pair. SEE ALSO: buffer capacity. SYN: buffer index.- buffer v. of the blood the ability of the blood to compensate for additions of acid or alkali without disturbance of the pH.- homing v. in a cybernetic system such as homeostasis, that v. of a trait of interest that the restorative forces are directed towards maintaining.- maturation v. an indicator of the level of maturation attained by vaginal epithelium and used as a factor in cytohormonal evaluation from the maturation index by valuing the parabasal cells at 0.0, the intermediate cells at 0.5, and the superficial cells at 1.0; for special investigations, subtypes of a major cell can be given different values.- normal values a set of laboratory test values used to characterize apparently healthy individuals; now replaced by reference values.- pH v. pH.- phenotypic v. in quantitative genetics, the metrical quantity of some trait associated with a particular phenotype.- predictive v. an expresion of the likelihood that a given test result correlates with the presence or absence of disease. A positive predictive v. is the ratio of patients with the disease who test positive to the entire population of individuals with a positive test result; a negative predictive v. is the ratio of patients without the disease who test negative to the entire population of individuals with a negative test.- Rf v. Rf.- reference values a set of laboratory test values obtained from an individual or group in a defined state of health; this term replaces normal values, since it is based on a defined state of health rather than on apparent health.- thiocyanogen v. SYN: thiocyanogen number.- threshold limit v. (TLV) the maximum concentration of a chemical recommended by the American Conference of Government Industrial Hygienists for repeated exposure without adverse health effects on workers.* * *Valsartan Antihypertensive Long-term Use Evaluation
* * *val·ue (valґu) 1. a measure of worth or efficiency. 2. a quantitative measurement of the activity, concentration, or some other quality of a substance; see normal v's.
Medical dictionary. 2011.