Home/Topics/Tests, Imaging & Diagnosis/molecular diagnosis Tests, Imaging & Diagnosis Genetics & Molecular Medicine molecular diagnosis Listen Save Share Print Meaning of molecular diagnosis: The process of identifying a disease by studying molecules, such as proteins, DNA, and RNA, in a tissue or fluid. Definition of molecular diagnosis The process of identifying a disease by studying molecules, such as proteins, DNA, and RNA, in a tissue or fluid. Written and maintained by James Murray · Last updated July 21, 2026 Educational reference, not medical advice. Read the limitations. Keep exploringRelated termsMore in Tests, Imaging & Diagnosis → Genetics & Molecular Biology deoxyribonucleic acid The full chemical name of DNA, and it is descriptive: a sugar missing an oxygen, a nucleus, and an acid. Read definition → Genetics & Molecular Biology DNA Two meters of it are packed into a cell too small to see, arranged so any short stretch can still be found and read. Read definition → Genetics & Molecular Biology hereditary Present from the first cell onward, even when nothing shows for decades, and never the same claim as present at birth. Read definition → Biological & Chemical Substances adenosine triphosphate Cells hold only a tiny standing amount and recycle it endlessly, so adenosine triphosphate works as a currency rather than as a store of energy. Read definition →
Genetics & Molecular Biology deoxyribonucleic acid The full chemical name of DNA, and it is descriptive: a sugar missing an oxygen, a nucleus, and an acid. Read definition →
Genetics & Molecular Biology DNA Two meters of it are packed into a cell too small to see, arranged so any short stretch can still be found and read. Read definition →
Genetics & Molecular Biology hereditary Present from the first cell onward, even when nothing shows for decades, and never the same claim as present at birth. Read definition →
Biological & Chemical Substances adenosine triphosphate Cells hold only a tiny standing amount and recycle it endlessly, so adenosine triphosphate works as a currency rather than as a store of energy. Read definition →