Clinical Lab- Pathology Flashcards
(23 cards)
What are 2 types of analytical variables?
interfering substances, instrument issues
No anticoagulant but has clot activator and gel for separating cells from serum. Used for serology and chemistry tests.
Red/gray tube
How close the measure value is to the true value of the analyte
accuracy
Heparin anticoagulant. Used for blood gases and chemistry tests.
Green tube
Probability of a person having a disease given a positive test or of a person not have a disease given a negative test.
predictive value
The range of values into which 95% of people without disease will fall.
normal range
Disease, negative test result
false negative
Anything that can happen after results are reported
post-analytical variables
Affects test results before they are analyzed
preanalytical variables
Nothing added to glass tubes or clot activator in plastic tubes. Used for serology, blood bank, chemistry tests.
Red tube
Number of existing cases in a population
prevalence
Citrate anticoagulant. Used for coagulation tests.
Light blue tube
Acid-citrate-dextrose (ACD) or sodium polyanethol sulfonate (SPS). Used for blood bank studies (ACD) or blood cultures (SPS).
Yellow tube
What are 3 types of preanalytical variables?
sample collection, sample handing, pt factors
Fluoride with oxalate anticoagulant. Used for glucose (antiglycolytic agent) and lactate.
Gray tube
Probability of a negative test in a person without a disease
specificity
No disease, positive test result
false positive
EDTA anticoagulant. Used for CBC and ammonia tests.
Purple tube
Number of new cases in a population per unit time
incidence
Nothing added but stopper is specially treated. Used for trace elements, nutritional studies, and toxicology.
Dark blue tube
Anything that can interfere with the actual analysis of the test by the lab
analytical variables
Probability of a positive test in a person with a disease
sensitivity
How reproducible is the result with repeated testing
precision
