Pipets & volumetric glassware w/ manufacturing variation; electronic & optical variations in instruments (e.g. spectrophotometers)
RANDOM ERRORS
Variations in the cuvet
RANDOM ERRORS
Variations in timing & °T control
RANDOM ERRORS
Variations in light, evaporation & °T on serum sample
RANDOM ERRORS
Interferences from other substances in the sample
RANDOM ERRORS
Aging phenomena
SYSTEMATIC ERRORS
Personal bias of the analyst
SYSTEMATIC ERRORS
Laboratory bias
SYSTEMATIC ERRORS
Inter- & intra-individual bias
SYSTEMATIC ERRORS
Experimental errors or changes in the methods
SYSTEMATIC ERRORS