Which of the following statements is correct regarding the size of he precipitin ring in a radial immunodiffusion technique, where antigen is allowed to diffuse through an agarose gel containing its corresponding antibody?

Which of the following tests is classified as an unlabeled precipitation assay?

In an enzyme immunoassay, an on board (included internal) control produces a colored line in the reaction window in an area labeled “C” for control.  If both the patient sample and the colored line are not present, the laboratory professional should:

This term is used to describe an antigen with more than one specific epitope:

Which of the following complement proteins is a component of the classical complement pathway?

Electrophoresis is defined as:

Consider a patient with a very high level of serum antibody directed against a viral pathogen; determination of the antibody titer using a precipitation assay produces a negative result with 1/2 and 1/4 dilutions of patient serum, but produces a strong result with 1/8 and 1/26 and higher.  This result is related to antibody excess in the patient serum and is referred to as:

Natural Killer cells are similar to cytotoxic T cells, but how are they different? 

You have performed a titer of an antibody present in serum, which produces agglutination. The last test tube to show agglutination is tube 5, the 1/16 dilution. You would report out a titer of:

The precipitation reaction is a serologic method in which: