Laboratory Diagnosis Flashcards
2 types of examination
Direct and Indirect Examination
Specimen is what?
Examined Directly
what can be directly examined under a specimen
- Virus Particles
- Viral Antigen
- Inclusion Bodies
- Virus Nucleic Acid
what are the examination under direct examination
clue; ACCEN (asin)
- Antigen Detection
- Electron Microscopy
- Cytology (Light Microscopy)
- Classical Molecular Technique
- Newer Molecular Techniques
what are the test found under Antigen Detection
- Immunofluoresence (IF)
- ELISA (Enzyme-Linked Immunosorbent Assay)
- Latex Agglutination
Immunofluoresence (IF)
dye used
Dye Fluorescein Isothiocyanate
Immunofluoresence (IF)
Positive result
Apple Green Florescence with reddish brown counterstained cells
Immunofluoresence (IF)
Result
Viral antigen is detected or Viral antigen is not detected
what should be done with Immunofluoresence result?
- Should be correlated with clinical status of the patient
- Check the epidemiological situation
ELISA (Enzyme-Linked Immunosorbent Assay)
Positive Result
Color Formation
ELISA (Enzyme-Linked Immunosorbent Assay)
Types
- Solid Phase (test tube or microtiter plate)
- Membrane Bound (nitrocellulose membrane)
Latex Agglutination
Positve Result
Agglutination
Latex Agglutination
if the plasma contains anti bodies, what will happen
world stop
chz agglutination
Electron Microscopy - TOF
10 to the 6th virus particle per mL is required for visualization
True
i also dk what shes talking abt <3 - this is abt the micrscope
Electron Microscopy - TOF
electron micrscropy it can be made more sensitive, even at lower viral particles by using immunoelectron microscopy
T
Electron Microscopy
Magnification:
50,000 to 60,000
Cytology
uses what microscopy
Light Microscopy
Cytology
what does this detect
changes in cells
Cytology - TOF
checks for viral particles in cell
False
Cytology
Rapid diagnosis of viral infections that produce??
Cytopathic Effects (CPE)
Cytology
Characteristics of CPEs:
- Changes in cell morphology
- Cell lysis
- Vacuolation
- Syncytia
- Inclusion Bodies
Cytology - TOF
Sensitive and Specific
False