Venous Blood Gas (VBG) is a test that measures the levels of gases, such as oxygen and carbon dioxide, as well as the pH of blood taken from a vein. This test helps assess a person's respiratory and metabolic status, providing valuable information about how well the body is managing oxygen and carbon dioxide levels. VBG is often used in clinical settings to evaluate conditions like respiratory failure, metabolic disorders, and acidosis. It is less invasive than an arterial blood gas (ABG) test, making it a more comfortable option for patients while still offering important insights into their health.