ISBB Flashcards
Normal serum proteins that can rapidly increase during an inflammation
Acute Phase Reactants
Concentration of CRP to be positive
0.6 mg/dL
Can be elevated during surgery and pregnancy
CRP
How much sample is needed in CRP/ASO/RF test
50 ul
Most widely used serological test for the detection of Group A hemolytic streptococcus infection
Anti-Streptolysin O Test
After how many minutes should CRP/ASO/RF be observed during testing?
2 minutes
Most common autoimmune disease; involves in the production of IgM or IgG antibodies against IgG
Rheumatoid Arthritis
Rheumatoid factors are directed against the ________ of the IgG molecules
Fc fragment
HIV strain most common in the USA
HIV-1
Test kit detects gp 36 for this type of HIV
HIV-2
Principle of HIV test kits
Lateral Flow Immunochromatography
Foundation of ISBB
Antigen-Antibody Interactions
Antigenicity Factors
Foreignness, Molecular Weight, Complexity
Most immunogenic composition
Proteins
Antibody class that exists as dimers in secretions
IgA
Antibody class conducive for agglutination
IgM
Prepared to provide accurate serum:cell ratio
Red Cell Suspensions
Excess antibody
Prozone
Formula for pRBC volume
%RBC * Total Volume
Grade agglutination: 2+
medium agglutinates
Simplest and most common application of Ag-Ab interaction
ABO/Rh Typing
What is the recessive gene among ABO genes?
O gene
Precursor antigen
H antigen
RBC structure without antigen
glucose-galactose- N-acetylglucosamine -galactose
Immunodominant sugar for A antigen
N-acetylgalactosamine
If A antigen in present in the RBC, what antibody is present in the serum?
Anti-B
Sample: red cells/ whole blood
Reagent: antisera
Tests for: antigens on RBCs
Forward Typing
Anti-A - 4+
Anti-B - 4+
A Cells - 0
B Cells - 0
AB
Problem with antibodies in reverse typing
Group I Discrepancies
Less common discrepancy
Group II
Seen in: Multiple myeloma, Waldenstrom’s macroglobulinemia, Wharton’s jelly
Group III
Agglutinates A1 or A1B cells, but not A2
Dolichos biflorus
Expected Panel Result: A Cells - 4+ B Cells - 4+ O cells - 4+ Anti-A - 0 Anti-B - 0 Autocontrol - 0
Bombay phenotype
often associated with the diseases of the digestive tract
Acquired B phenomenon
Unique Discrepancies
- Presence of A/B subgroups
- Bombay Phenotypes
- Acquired B Phenomenon
ABO Discrepancies:
Mixed Field
Group O transfusions, stem cell transplant
7 Physical Examination of Donors
Age, Weight, Pulse, Blood Pressure, Temperature, Hemoglobin, Hematocrit
What does the primary capture antibody in test kits interact with?
Analyte (Ag)
T or F: Presence of two bands in HIV test kits indicates co-infection
False
T or F: In the absence of HbsAg, presence of Anti-Hbc indicates immunity.
False. It indicates recovery.
Marker of immunity
Anti-Hbs
RPR result:
large and medium black floccules against white background
Reactive
Often used to obtain titers
Serial dilution
Blood bag anticoagulant component that is a substitute for ATP production
Dextrose
Some are termed as non-agglutination / incomplete antibodies
IgG
Last check of ABO compatibility
Crossmatching
Phase that detects ABO incompatibilities
Immediate Saline Spin Phase
Causes of Positive Crossmatch
- Incorrect ABO Grouping
- Presence of alloantibodies (ac - neg)
- Presence of autoantibodies (ac - pos)
- Proteins coating donor RBCs
- Abnormalities in plasma
How many minutes should RPR be read? What should be observed?
Observed for flocculation within 8 minutes.
Antigen detected within first 1-9 days of dengue infection
NS1 antigen