Leak testing is required by medical devices, which have fluid management functions. Medical devices form a barrier between fluids or gases that could create a danger for the patient if they were allowed to mix. If a leak along the pathway exists, then the fluids could be delivered to the wrong part of the patient's body or bodily fluids could gather inside the body with dangerous consequences. With medical devices, it is important to perform a leak test on 100 percent of the product without adding significant costs.