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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.
One of those is a blood test that confirms whether a person is seropositive or seronegative. Being seropositive does not mean that you absolutely have RA; it does help determine conclusively that a person has the disease when other tests show a similar outcome. What Does it Mean to be Seropositive? To determine if a person is seropositive for RA, a doctor will order a blood test. The blood test is used to help medical experts find two proteins: rheumatoid factor (RF) and anti-CCP. When either of these proteins are present in the blood test it may indicate that RA is present in the body.