The branch of medicine concerned with the skin and its appendages. Surface appearances can reflect local injury, inflammation, infection or systemic processes, making morphology informative without being a complete diagnosis.

The branch of medicine concerned with breathing, gas exchange and respiratory disease. Airflow, lung expansion, diffusion and blood flow can each limit respiratory performance through different mechanisms.

The branch of medicine concerned with the heart and its disorders. Electrical activation, blood flow, muscle function and valve mechanics provide complementary explanations of cardiac symptoms and measurements.

Administration of fluid to alter or maintain the body’s fluid and electrolyte balance. Replacement of a deficit and ordinary maintenance address different needs; a fluid’s composition affects its distribution and physiological consequences.^[ref]

A laboratory panel measuring blood-cell quantities and related characteristics, including red cells, white cells and platelets. The pattern can guide further investigation, but no single abnormal count identifies every cause.^[ref]

The branch of medicine concerned with inflammatory, autoimmune and other disorders of joints and connective tissues. Similar patterns of pain can arise through different mechanisms, making anatomical distribution and systemic findings important.

Removal or sampling of tissue for examination, often by microscopy. A biopsy can establish features of the sampled area; its ability to represent a larger lesion depends on where and how the sample was obtained.

A feeling of impending loss of consciousness. The word should not automatically be substituted for a demonstrated episode of syncope.

The branch of medicine concerned with the female reproductive system outside the direct management of pregnancy and childbirth. It connects symptoms such as abnormal bleeding with anatomical, endocrine and cellular explanations.

An abnormally low concentration of calcium in blood. Total and ionized calcium are different measurements; changes in protein binding can alter total calcium without an equivalent change in its physiologically active fraction.

The branch of medicine concerned with disorders of the ear, nose, throat and related head-and-neck structures. Its problems connect sensory function, breathing, swallowing and communication with local anatomy.

Introduction of fluid into the lower intestine for a specified diagnostic or therapeutic purpose. Mechanical evacuation of selected faecal impaction differs from a systemic treatment of the underlying cause of constipation.^[ref]

Treatment intended to increase urine output. Current guidance uses monitored diuretic therapy for acute heart failure; it is distinct from loss of blood through venesection. ^[ref]

Tissue injury caused by heat or other damaging exposures.

Investigation of health and disease through measurements on biological samples. A result depends on sampling, analytical performance and biological context; a value outside a reference interval does not by itself establish one diagnosis.

An instrument or apparatus intended for medical investigation or treatment.

Restriction of bodily movement by physical means. Its clinical indication and legal justification must be distinguished from authority for institutional admission.

Emergency support of blood circulation and breathing during cardiac arrest. Chest compression supplies limited blood flow while other interventions address oxygenation and the cause of arrest; resuscitation is a process, not evidence that normal blood circulation has already returned.

Transillumination examines internal structure using light transmitted through a body region or specimen. The source illuminates one side and the observer or detector records light emerging after propagation through the material. Different optical absorption and scattering properties can create image contrast.^[ref]

A simple physical demonstration illuminates a fingertip from behind and observes the diffuse transmitted glow. Its appearance depends on wavelength, path length and the tissue's optical properties. Strong scattering redistributes the paths, so a brightness difference cannot generally be interpreted as a sharply localized anatomical boundary without an additional model.

Magnetic resonance cholangiopancreatography is a form of magnetic resonance imaging used to visualize the bile ducts and pancreatic duct. Its apparatus uses a magnetic field, radiofrequency excitation and spatially encoded magnetic-resonance signals to produce images of the ductal region. The image depends on the selected acquisition and reconstruction, so visible duct structure is an inference from that signal rather than a direct optical view.^[ref]