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SIM test is a test performed to test for sulfur reduction, Indole production and motility. Black color formed= positive for sulfur reduction Red color after adding Kovacs reag â¦ ent= positive for Indole production Microorgaism growth all over the tube= motile.
Talk to your doctor about the meaning of your specific test results. A negative value usually means that alcohol, prescription medications that have not been prescribed, and illegal drugs have not been detected. A blood toxicology screen can determine the presence and level (amount) of a drug in your body. Urine sample results are usually reported as positive (substance is found) or negative (no substance is found).