Recirculated Information and Courses from MediaLab, Inc.
These are the MediaLab courses that cover Recirculated and links to relevant pages within the course.
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| Bilirubin Characterization Bilirubin, a product of hemoglobin breakdown, is characterized by its yellow pigment. The presence of bilirubin in urine is always abnormal. It is important to note that unconjugated bilirubin cannot be excreted by the kidneys because it is bound to albumin and is not soluble in water. In the liver, bilirubin combines with glucuronic acid through the action of a glucuronyl transferase to form water soluble bilirubin diglucuronide. Under normal circumstances, conjugated bilirubin passes from the bile duct and then to the intestinal tract. Intestinal bacteria reduce conjugated bilirubin to urobilinogen. Approximately half of the urobilinogen is excreted in the feces; most of the other half is recirculated through the liver. A small amount of urobilinogen bypasses the liver and is excreted in the urine. | View Page |
| Which of the following secondary barriers are recommended for microbiology laboratories that work with Biosafety level 3 agents (e.g., Mycobacterium tuberculosis)? | View Page |
| Biosafety Level 3 Biosafety level 3 practices, safety equipment, and facility design and construction are applicable to microbiology laboratories that work with indigenous or exotic agents with a potential for respiratory transmission, and which may cause serious and potentially lethal infection. Mycobacterium tuberculosis is assigned to this biosafety level. At biosafety level 3, laboratory manipulations should be performed in a Class l or Class ll biosafety cabinet (BSC) or other physical containment device. Secondary barriers include controlled access to the laboratory and ventilation requirements that minimize the release of infectious aerosols from the laboratory. Secondary barriers should include self-closing double-door access and negative airflow into the laboratory. Exhausted air must not be recirculated. | View Page |