👉 The counted fluid, also known as total body water or TBSH, refers to the total amount of water present in a person's body, including all its compartments. This includes water in the intracellular space (inside cells), extracellular fluid (ECF) which is further divided into two parts: plasma (the liquid portion of blood) and interstitial fluid (fluid surrounding cells). The counted fluid accounts for approximately 60% of a person's total body weight in water, making it crucial for maintaining bodily functions such as temperature regulation, nutrient transport, and waste removal. Accurate measurement of the counted fluid is essential in clinical settings for diagnosing and monitoring various health conditions, including dehydration, edema, and electrolyte imbalances.