Fluid status refers to the balance of fluid in the body, encompassing both the volume and distribution of extracellular and intracellular fluids. It is crucial in clinical practice as it influences blood pressure, organ perfusion, and electrolyte balance, impacting patient outcomes in conditions like heart failure or dehydration. A key association is the risk of fluid overload, which can lead to pulmonary oedema, particularly in patients with compromised cardiac function.