5. Immunology and Serology

Immunoassays — Quiz

Test your understanding of immunoassays with 5 practice questions.

Practice Questions

Question 1

In a chemiluminescent immunoassay, the light signal is generated by a chemical reaction. Which of the following best describes the role of the 'substrate' in this process?

Question 2

When troubleshooting an automated immunoassay system, if the system consistently reports 'carry-over' issues between samples, which of the following is the most appropriate initial step?

Question 3

Consider a fluorescent immunoassay where the fluorophore has a quantum yield of $ \Phi = 0.85 $. If the excitation energy absorbed is $ E_{ex} = 1.5 \times 10^{-19} \text{ J} $, and the average energy of an emitted photon is $ E_{em} = 1.2 \times 10^{-19} \text{ J} $, what is the approximate number of photons emitted per excitation event?

Question 4

In the context of immunoassay calibration, what is the primary reason for using a 'four-parameter logistic (4PL) curve' fitting model for the standard curve?

Question 5

A medical laboratory scientist is troubleshooting a chemiluminescent immunoassay and observes that the signal is consistently high, even in negative controls. Which of the following is the most probable cause?