Oxidizing Information and Courses from MediaLab, Inc.
These are the MediaLab courses that cover Oxidizing and links to relevant pages within the course.
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| False Positive Results False positive results can be attributed to strong oxidizing agents such as hydrogen peroxide (H2O2) or bleach (hypochlorite). | View Page |
| False Positive Results A false positive result for blood on the reagent strip can occur when oxidizing contaminants, such as hypochlorite (bleach), remain in collection bottles after cleaning. Contamination of the urine with provodine-iodine, a strong oxidizing agent, used in surgical procedures can result in a false positive reaction. Microbial peroxide found in association with urinary tract infections may also cause false-positive results. Capoten® (Captopril) can cause decreased reactivity. The muscle tissue form of hemoglobin, myoglobin is a well-known cause of false-positive reactions on the blood portion of the reagent strip. When tissue hemoglobin is present, the urine specimen has a clear red appearance. Patients suffering from muscle-wasting disorders or muscular destruction due to trauma, prolonged coma, or convulsions or individuals engaging in extensive exertion may have myoglobin in their urine. Specific tests for myoglobin, such as immunodiffusion techniques or protein electrophoresis, are needed to confirm the presence of this substance in a urine specimen. Levels of ascorbic acid normally found in urine do not interfere with this test. | View Page |
| False Positive Leukocyte Esterase Test A false positive result may occur in the presence of strong oxidizing agents in the collection container. In random urine specimens from women, a positive result for leukocyte esterase may be due to a source external to the urinary tract. Other urine sediment findings such as bacteria, squamous or renal epithelial cells, lymphocytes or red blood cells do not contain esterases, and would not produce a positive leukocyte esterase test. | View Page |
| A negative sugar result on a reagent stick and a positive Clinitest® result on the same specimen indicates: | View Page |