Why Is Indirect Immunofluorescence More Sensitive

One of the main reasons for using the indirect method is an increase in the lower limit of detection. Since two or more labeled secondary antibodies are able to bind a single primary antibody, the result is an amplification in signal and an increase in assay sensitivity.

Is indirect or direct immunofluorescence more sensitive?

Since several secondary antibodies can bind with a primary antibody and several fluorophores can conjugate with secondary antibodies, indirect immunofluorescence is a more sensitive method than the direct method. Furthermore, the indirect method is less expensive than the direct method.

What is the main advantage of indirect compared to direct immunodetection?

Comparison of Direct and Indirect Detection Methods Often gives a stronger signal because multiple secondary antibodies bind to each primary antibody. Easy to change label type or detection methods for a new experiment by swapping secondaries.