No fasting is required prior to this test. The test evaluates how your body processes sugar. A high level in your blood may indicate your body is not processing sugar effectively (positive test). If the results of this screen are positive, the woman may have the Glucose Tolerance Test performed.
A valve is a mechanism that opens and closes to control the flow of fluids. In a scientific context, fluids include both liquids and gases â any substance that can flow freely â and valves may use either. Valves control fluid flow in motors, plumbing, irrigation, pneumatic and hydraulic systems.
A valve may control fluid flow to one or, often, as many as four ports. Valves vary greatly in cost and size from as small as 0.1mm (millimeter) to as big as 5m (meters) in special applications. Valve also happens to be the name of the game developer and purveyor of the largest game distribution service: Steam.