(4.1) IMMUNOLOGICAL TECHNIQUES

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Questions and Answers

What is the primary purpose of performing a wash in laboratory tests?

  • To change the pH of the solution
  • To increase the concentration of solutions
  • To remove excess binding and particles (correct)
  • To enhance the visibility of antigens

How is sensitivity defined in the context of a diagnostic test?

  • The probability that the test will be positive in a patient who has the disease (correct)
  • The probability that the test will be negative in a patient who has the disease
  • The ability of the test to correctly identify patients without the disease
  • The measure of how well the test can distinguish between two different diseases

What does the term avidity refer to in antibody interaction?

  • The specific affinity of an antibody for a single epitope
  • The speed at which an antibody binds to an antigen
  • The overall strength of interaction due to multiple binding sites (correct)
  • The likelihood of a false positive result in testing

In a precipitation reaction, what occurs in the zone of antibody excess?

<p>Small soluble complexes are formed without precipitation (B)</p> Signup and view all the answers

Which immunoglobulin molecule is preferred for testing due to its high valence and avidity?

<p>IgM (C)</p> Signup and view all the answers

What are the two critical metrics in evaluating the reliability of a diagnostic test?

<p>Sensitivity and specificity (A)</p> Signup and view all the answers

Which of the following describes the function of preliminary immunological tests?

<p>To quantify levels of antibodies present (A)</p> Signup and view all the answers

In the context of antibody-antigen interactions, what is a primary concern when interpreting test results?

<p>Evaluating how affinity relates to the concentration of antibodies (C)</p> Signup and view all the answers

What is the significance of the three zones in the precipitin reaction?

<p>They indicate the range of antigen concentration for effective diagnostics. (A)</p> Signup and view all the answers

Which scenario would necessitate using a qualitative test instead of a quantitative test?

<p>Determining if a certain allergen triggers an immediate immune response (D)</p> Signup and view all the answers

What does sensitivity measure in a diagnostic test?

<p>The probability the test will yield a positive result in a person with the disease (B)</p> Signup and view all the answers

What is indicated by a false positive outcome in a diagnostic test?

<p>The test incorrectly identifies a patient as having the disease (A)</p> Signup and view all the answers

Which of the following statements about specificity is true?

<p>It reflects the test's ability to correctly identify healthy individuals (A)</p> Signup and view all the answers

Which of the following components are used to calculate sensitivity and specificity?

<p>Observed outcomes in a 2 × 2 table (D)</p> Signup and view all the answers

What is a true negative outcome in a diagnostic test?

<p>Test fails to detect the condition when it is absent (C)</p> Signup and view all the answers

Why is it important to understand the reliability of a test before diagnosis or treatment?

<p>It helps in understanding likely patient outcomes (D)</p> Signup and view all the answers

How can false negative results affect patient diagnosis?

<p>They may indicate the disease is absent when it is present (C)</p> Signup and view all the answers

What is primarily disrupted during agglutination of particulate antigens?

<p>The homogeneity of the suspension (C)</p> Signup and view all the answers

Which assay method is NOT typically associated with soluble antigens?

<p>Indirect agglutination (D)</p> Signup and view all the answers

In indirect agglutination, which component is used to facilitate cross-linking?

<p>Anti-immunoglobulin (A)</p> Signup and view all the answers

Which of the following scenarios represents an example of hemagglutination?

<p>Clumping of erythrocytes due to an antibody reaction (C)</p> Signup and view all the answers

Which method is primarily used for quantifying epitopes by/using antibodies?

<p>Enzyme-linked immunosorbent assay (ELISA) (D)</p> Signup and view all the answers

What type of hypersensitivity is assessed through allergy skin testing?

<p>Type I hypersensitivity (C)</p> Signup and view all the answers

Which component is leveraged in radioimmunoassay for quantifying substances?

<p>Radioactive isotopes (B)</p> Signup and view all the answers

Which of the following techniques can be used for both particulate and soluble antigens?

<p>Enzyme-linked immunosorbent assay (ELISA) (B)</p> Signup and view all the answers

What is the role of IgM antibodies in direct agglutination?

<p>They efficiently cross-link epitopes on adjacent particles. (C)</p> Signup and view all the answers

What phenomenon is described when too much antibody inhibits agglutination?

<p>Prozone effect (D)</p> Signup and view all the answers

What is the purpose of using serial dilutions of antibody in agglutination reactions?

<p>To prevent the prozone effect. (D)</p> Signup and view all the answers

In indirect agglutination, what enhances the sensitivity of detecting low concentrations of antibodies?

<p>Adding a secondary antibody reagent. (B)</p> Signup and view all the answers

What does the term 'titer' refer to in the context of agglutination?

<p>The highest dilution ratio that still causes agglutination. (A)</p> Signup and view all the answers

What are soluble antigens expected to do during a quantitative precipitin reaction?

<p>Precipitate from solution upon interaction with the appropriate antibody concentration. (A)</p> Signup and view all the answers

Which method is NOT commonly used for visualization of immune precipitates?

<p>Western blotting (A)</p> Signup and view all the answers

Why might human antibodies not directly agglutinate antigen-bearing particles?

<p>Their structure may prevent direct interaction with the particles. (B)</p> Signup and view all the answers

What is a typical outcome when a quantitative precipitin reaction is performed?

<p>Variability in precipitate formation due to different antibody concentrations. (C)</p> Signup and view all the answers

Flashcards

Office Hours (Tuesday)

Virtual office hours will be held Tuesday from 4:00 PM to 5:00 PM.

Office Hours (Thursday)

In-person office hours will be held Thursday from 4:00 PM to 5:00 PM in 3 16 j.

Module 4 Lecture Topics

Module 4 will cover immunological techniques, vaccines, primary and secondary immunodeficiencies.

Wednesday Lecture

Wednesday's lecture will be on vaccines.

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Friday Exam

The final exam for the course is scheduled for Friday.

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Asynchronous Monday Lecture

The Monday lecture will be an asynchronous documentary review.

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Review Paper

A review paper is required based on the documentary.

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Primary/Secondary Immunodeficiencies

Module 4 also covers deficiencies of the immune system.

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Asynchronous Research Day

Friday the 15th is an asynchronous research day for all BMS classes.

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Bonus Point Opportunity

Students can earn an extra bonus point, but only once.

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Marion Research

An opportunity to learn about ongoing research, meet faculty and fellow medical students, and have snacks and coffee.

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Transplantation

The process of replacing diseased or damaged organs with healthy ones.

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Immune Pharmacotherapy

The use of drugs to modify the immune response, for treating diseases like cancer.

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Hypersensitivity

An excessive immune response to an antigen, often causing harm to the body.

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Thanksgiving Break

A break in classes to coincide with Thanksgiving holidays with a recorded lecture choice.

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Autoimmune Disorders

Conditions where the immune system attacks the body's own cells.

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Case Studies

Interactive exercises concerning diseases, to aid in the understanding of clinical presentation and immune system roles.

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Final Debrief

A summary session of the semester's learnings and synthesis of information.

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CD40 deficiency

An immunodeficiency where a protein that helps immune cells communicate malfunctions.

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Sensitivity and Specificity

Measures used to assess diagnostic tests.

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Diagnostic Equations

Calculations used to evaluate the accuracy of a diagnostic test.

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True Positive

A positive test result that accurately identifies a person with the condition.

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True Negative

A negative test result that accurately identifies a person without the condition.

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Antibody-Antigen Interaction

The binding of an antibody to an antigen, forming an antigen-antibody complex.

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Affinity

The strength of the interaction between a single antibody binding site and a single antigen binding site.

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Precipitin Reaction

The process where soluble antigen reacts with soluble antibody, forming insoluble complexes that precipitate out of the solution.

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Quantitative Curve

A graph showing the amount of precipitate formed based on different concentrations of antigen and antibody.

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Zone of Equivalence

The zone on a precipitin curve where equal amounts of antigen and antibody are present, leading to the maximum amount of precipitation.

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Zone of Antigen Excess

The zone on a precipitin curve where there is too much antigen compared to antibody, resulting in little or no precipitation.

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Zone of Antibody Excess

The zone on a precipitin curve where there is too much antibody compared to antigen, resulting in little or no precipitation.

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Qualitative Tests

Tests that determine if something is present or absent, but don't provide numerical measurements.

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Quantitative Tests

Tests that measure the amount of something present.

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Sensitivity

The probability a test will be positive in a person with the condition.

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Specificity

The probability a test will be negative in a person without the condition.

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True Positive

A test result that correctly identifies the presence of a condition.

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True Negative

A test result that correctly identifies the absence of a condition.

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False Positive

A test result that incorrectly identifies the presence of a condition.

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False Negative

A test result that incorrectly identifies the absence of a condition.

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Valence

Number of antibody binding sites on an antibody molecule.

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Avidity

The overall strength of an antibody-antigen interaction, considering the number of binding sites.

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Prozone

A phase in a test where the result appears negative initially due to excess antibody.

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Diagnostic Sensitivity

Probability a test is positive in a person with the condition.

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Diagnostic Specificity

Probability a test is negative in a person without the condition.

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Antibody-Antigen Affinity

Strength of a single antibody-antigen interaction.

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Precipitin Reaction

Formation of insoluble complexes from soluble antigen-antibody.

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Quantitative Curve

Graph of precipitate amount vs. antigen/antibody concentration.

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Zone of Equivalence

Optimal antigen-antibody ratio for maximum precipitation.

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Qualitative Test

Determines presence/absence, not amount.

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Quantitative Test

Measures the amount of something.

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Sensitivity

The probability a test will be positive in a person who has the condition.

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Specificity

The probability a test will be negative in a person who does not have the condition.

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True Positive

A positive test result in a person who actually has the condition.

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True Negative

A negative test result in a person who does not have the condition.

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False Positive

A positive test result in a person who does not have the condition.

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False Negative

A negative test result in a person who actually has the condition.

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2x2 table

A table used to determine sensitivity and specificity of a diagnostic test.

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Direct Agglutination

A method of epitope detection using antibodies to clump particulate antigens, like bacteria or red blood cells.

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Indirect/Passive Agglutination

A method of epitope detection where antibodies bind to antigens, which are then detected using secondary antibodies.

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Radial Immunodiffusion

A method for quantifying soluble antigens by measuring the diameter of precipitation rings in a gel.

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Immunoelectrophoresis (IEP)

Separates proteins based on their electrical charge before undergoing double diffusion.

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Epitope Detection

Using antibodies to identify specific regions (epitopes) on antigens.

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Particulate Antigens

Antigenic particles such as cells, bacteria, or antigens bound to beads.

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Soluble Antigens

Antigens that are dissolved in a liquid.

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Agglutination

Clumping of particles due to antibody cross-linking.

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Hemagglutination

Clumping of red blood cells (erythrocytes) by agglutination.

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Direct Agglutination

A process where IgM antibodies cross-link epitopes on cells or particles, causing them to clump together.

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IgM Antibody

A large immunoglobulin known for its efficient cross-linking of epitopes on adjacent particles, contributing to agglutination

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Prozone effect

Inhibition of agglutination due to excess antibody.

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Titer

The lowest antibody concentration causing agglutination; a measure of antibody activity.

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Indirect/Passive Agglutination

A technique used to detect non-IgM antibodies or low-titer antibodies by adding an anti-immunoglobulin reagent.

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Quantitative Precipitin Reaction

A reaction where soluble antigens and antibodies form insoluble complexes that precipitate, requiring multiple samples due to complex measurements.

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Radial Immunodiffusion

A technique for detecting soluble antigens through visualization in agar.

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Double Diffusion

A method of visualizing antigen-antibody reactions in agar.

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Immunoelectrophoresis (IEP)

A technique combining electrophoresis and immunodiffusion.

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Study Notes

Lecture Location Change

  • Lecture will be held in the professor's office today.
  • Audio/video equipment more reliable in the office.

Office Hours

  • Tuesday 4:00 PM - 5:00 PM - Virtual
  • Thursday 4:00 PM - 5:00 PM - In person (location 316J)

Course Information

  • Current module: Immunology Techniques
  • Wednesday's lecture: Vaccines
  • Thursday's lecture: Immuno techniques
  • Friday: Exam

Personal

  • Professor will be out of town at a wedding Thursday morning and Monday.
  • Email or campus messaging best for contact.

Assignments

  • Review paper due Monday (documentary analysis) - 2-page double-spaced.

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IMM 4.1 (PT 1) TRANSCRIPT PDF

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