Wrong diagnosis

Question 1

error

Answer 1

unintended act, failure of a planned act, use of wrong plan, any deviation from process of care that may or may not cause harm to patient

Question 2

pre analytical error

Answer 2

errors in specimen collection

non-fasted patient - lipemia
in vitro hemolysis - traumatic sample collection , improper sample handling, extreme temperatures or delayed processes
clotted - traumatic or slow collection or improper mixing with coagulant
insufficient sample volume - short sample - wrong proportion of anticoagulant to sample
delayed processing - morphologic changes

Question 3

analytical errors

Answer 3

errors in test

sensitivity = ability to correctly detect diseased animals
specificity = ability to correctly detect non-diseased animals

Question 4

screening tests

Answer 4

cut off value chosen

eg FIV point of care ELISA - kittens of FIV+ cats may have antibodies for up to 6 weeks

must confirm any positive results in non-prevalent population

Question 5

pros and cons of screening tests

Answer 5

pros - quick, narrows down a group
cons - false positives common