For units in astronomy, see astronomical system of units. The astronomical unit (symbol au, AU or ua) is a unit of length, roughly the distance from the Earth to the Sun. However, that distance varies as the Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once a year.
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Hemoccult SENSA. Hemoccult II SENSA. The Hemoccult II SENSA test is a rapid, convenient and qualitative method for detecting fecal occult blood which may be indicative of gastrointestinal disease. It is not a test for colorectal cancer or any other specific disease. Hemoccult II SENSA is the enhanced Hemoccult product that provides improved readability and higher clinical sensitivity over regular Hemoccult and other FOBTs.