A polymerase chain reaction (PCR) test detects genetic material from a pathogen or abnormal cell sample. Ways of collecting samples include a nasal swab, a saliva swab, or taking a sample of blood.

What Is the Immunohistochemistry Test? The immunohistochemistry (IHC) test can tell your cancer doctor (oncologist) whether you have certain types of breast cancer. Professionals in a lab check a ...

If a medical test result is inconclusive, the sample did not provide enough information to confirm a positive or negative result. A person may need another test. People can have various medical tests ...