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Lab Math defenitions

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Solute:

Is a substance dissolved in a mixture

Density:

Amount of matter per unit volume

Calibration:

The process of checking, using standard

solutions, adjusting a method or instrument so it yields accurate results

Reportable Range:

Span of test values which lab establishes the accuracy of an instrument

Accuracy:

Closeness of a result to the true value

Predictive Values:

Sensitivity:

Scientific International Unit:

Modified metric system to ensure results are consistent in any part of the world

Blind patient control:

Used in place or addition to a commercial control

Confidence Intervals:

The reference range is expressed using 2SD on either side of the mean, with 95% of the values falling above and below the mean.

Also referred to as confidence limits

Proportion:

2 or more ratios having the same relative meaning but with different numbers

Panic Value:

Is a patient’s lab result that is life-threatening if action is not taken quickly

Reagent:

Any substance used to produce a chemical reaction

Meter:

The base unit of measurement of distance

Levy-Jennings Chart:

Daily quality control record

Celcius:

measurement of temperature

Reference Range:

same as normal range

Gram % Solution:

Percentage of gram weight in a solution

Blank Solutions:

Gram:

unit of weight

Normal Range:

Is the range of results that are expected to be found when a healthy individual is tested

Technical Grade:

Chemicals used for industrial purposes

Percent:

A value expressed as part of 100

Specificity:

Controls:

Material or solution with a known concentration of the analytes being measured

Standard:

Chemical solution of a known concentration that can be used as a reference or calibration substance

Quality Assurance:

Exponent:

Molality:

Stock Solution:

Concentrated solution used to make up working solutions

V/V Solution:

Volume to volume solution; 2 liquids

Molarity:

Ratio:

W/V Solution:

Weight to volume solution; the amount of solute in a solvent

Solution:

Median:

The middle value of an entire data set

pH:

Hydrogen ion concentration

Quality Control:

Osmolality:

Is the number of osmoles of solute per kilogram of solvent

Dilution:

A weaker solution made from a stronger solution

Litre:

Base unit to measure volume

Proficiency Testing:

Mean:

Average calculated from a series of numbers

Mode:

The number that comes up the most (the value that appears most frequently in a set of data)

Reliability:

Depending on test results to be accurate

Standard Deviation:

Is a measure of the spread or dispersion of a set of data

Coefficient of Variation:

Shows variability between 2 different sets of values

Analytical grade:

The most pure grade of chemical

Fahrenheit:

measurement of temperature

Precision:

Repeated results give the same value

Working Solution:

Is the solution for use; made from a stock solution

Westgard’s Rules:

Is a set of rules to determine if a method is in or out of control

Significant Figure or Digit:

a number whose accuracy is reliable

Specific Gravity:

Is a measurement of density, a ratio of the mass of a substance relative to water

Concentration:

Amount of 1 substance relative to the amount of another substance in a solution

Scientific Notation:

Is reducing large numbers by using exponents

Solvent:

A substance in which something is dissolved; for example water

Gaussian Curve:

Distribution of values around the mean

Therapeutic Range:

Mole:

Osmolarity:

Number of osmoles of solute per litre of solution

Osmole: