2nd lab Flashcards
Accuracy
comparison of measured value to accepted value
depends on person measuring and instrument
formula: (yv-av) x 100/av
Precision
reproducibility of a measurement, how close measurements are to each other.
Accuracy/ %error formula
(YV – AV) x 100 ÷ AV
values from -5 to 5 are
accepted
values less than -5 or more than 5 must be
remeasured
Proficiency testing is important because 1)
laboratory uses to verify the accuracy and reliability of its testing.
The significant figures in a measurement include
all of the digits that are known, plus one last digit that is estimated.
The numbers reported in a measurement are
limited by the measuring tool.
Every experimental measurement has a
degree of uncertainty
density
mass per unit volume
d= mass sample/volume sample
percentage range
used to evaluate precision of measurements
highest measured valure-lowest measured value/ average measured value (x100)
a best guess is needed for the
tenths place
Proficiency testing is important because 4)
may alert areas of testing that are not performing as expected.
Proficiency testing is important because 3)
may indicate subtle shifts and trends that over time, would affect patient results.
Proficiency testing is important because 2)
validation of quality results.
