👉 The Reached Fluid (RF) is a measure of the volume of blood that reaches the peripheral tissues, reflecting overall tissue perfusion and oxygen delivery. It is determined by measuring blood flow in the arterial system and estimating blood volume in the interstitial space, typically using techniques like Doppler ultrasound or nuclear medicine. RF is a critical indicator of cardiovascular health, as it integrates factors such as cardiac output, vascular resistance, and tissue metabolic demand. A reduced RF may signal conditions like heart failure, chronic obstructive pulmonary disease (COPD), or sepsis, where tissue oxygenation is compromised despite adequate blood flow. Unlike arterial pressure, RF accounts for the dynamic balance between blood volume and perfusion, making it a more holistic indicator of tissue health.
