interpretation of laboratory tests Flashcards
(15 cards)
what infectious agents can we see in blood smears
ehrlichia, anaplasma, babesia, cytauxzoon, mycoplasma
what infectious agents are on a snap 4dx plus
lyme, ehrlichia, anaplasma, HW
what infectious agents are in neutrophils
ehrlichia ewingii and anaplasma phagocytophilum
how could you confirm that an infectious agent is present
PCR
why could a snap be negative if the patient is infected
acute infection, not enough time for antibodies to be produced
what is unique about bartonella
needs special enrichment culture and PCR
what single RMSF titer is positive
> 1024
what does a negative RMSF antibody test tell you
it does not rule out disease
what does a positive snap ehrlichia test tell us
not a lot. can persist for months to years. PCR can support positive
what is gold standard lepto testing
MAT antibodies acute and convalescent
what is the most accurate lepto in house test
witness IgM. but if vaccinated in the last 3-4 months may not be accurate.
how to diagnose fungal disease
cytology/ histo or urine antigen assays
what to remember about trying to diagnose blasto with a urine antigen test
cross reacts with histo
what do we use fungal urine antigen tests for
watch the decrease to guide treatment and determine the response to treatment and when to discontinue
common way to diagnose cryptococcus
cytology on nasal swab. confirm with cryptococcus latex agglutination test
