What does "gel" mean in medical terms? In medical terms, gel has several meanings. Gel is semi-solid substance with jelly-like consistency used in medical applications, such as ultrasound gel used to improve contact between probe and skin for imaging, ECG gel for electrode contact, and topical gels for drug delivery like diclofenac gel for pain or hand sanitizer gel. Gel also refers to dosage form that is semi-solid preparation containing medication for topical application, such as topical anesthetic gel or vaginal gel. In laboratory medicine, gel electrophoresis uses gel matrix to separate DNA, RNA, or proteins by size. Gel also refers to phenomenon of gelling in blood or other fluids, such as clot formation. In orthopedics, gel phenomenon refers to stiffness after rest. So in medical terms, gel is semi-solid colloidal system used as medium, drug delivery form, or describes clotting or stiffening phenomenon, with applications in diagnostics, treatment, and laboratory separation techniques.
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