Same as law of conservation of energy. Fluid: material that flows, i.e. liquids, gases, and plasmas. Focal length: distance from the focal point to the center of a lens or vertex of a mirror. Focal point: location at which rays parallel to the optical axis of an ideal mirror or lens converge to a point. Forbidden gap: energy values that electrons in a semiconductor or insulator may not have. Force: agent that results in accelerating or deforming an object. Frame of reference: coordinate system used to define motion.
Tuberculosis skin test facts. 1  The tuberculosis skin test is also known as the tuberculin test or PPD test.  The PPD test is used to determine if someone has developed an immune response to the bacterium that causes tuberculosis (TB).
The QuantiFERON-TB Blood Test is used to aid in the diagnosis of both latent and active infections with the bacteria that causes Tuberculosis (TB).This test is one of only 2 blood tests for TB approved by the FDA. Tuberculosis is a bacterial disease that typically affects the lungs.t is estimated that 11 million people in the US have a latent Tuberculosis infection (LTBI). Diagnosis and treatment of LTBI can prevent it from progressing to active Tuberculosis. The TB blood test has several advantages over a skin test.