Answer :

Yes, some of the diseases can be detected before its symptoms like using PCR (Polymerase chain reaction) which is used to amplify a nucleic acid to obtain an amplified gene product which can show diseases before its symptoms.

Another method for detection of a disease before the symptoms is ELISA (i.e., Enzyme-Linked Immunosorbent Assay) which can give the concentration of antigens or a specific antibody, which can be used for detection of disease before its symptoms.

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