861: Increasing numbers of false positive Zika tests during pregnancy

False-positive urine pregnancy tests - clinicians as detectives

Reliably diagnosing pregnancy in women presenting with nonspecific abdominal pain can be lifesaving. If diagnostic tests are unreliable, however, valuable time and resources can be wasted pursuing unnecessary and potentially harmful interventions. After four false positive-urine pregnancy tests in one week, we began investigating the laboratory's entire process involving the UPreg tests. We dis...

False Positive Rubella Test In Pregnancy

A 28 years female pregnant; 15 week +3 days gestational age, G0, P1, A0; presented for routine antenatal care visit in primary health care center. She had done the investigation in privet hospital showing rubella +ve IgM, CMV +ve IgG. Taking full history, the patient had simple flu like illness several weeks ago with no treatment is needed, no recent contact with a case of rubella nor recent va...

Serological tests for syphilis in pregnancy. False and missed positive reactions.

Biological false positive serological tests for syphilis among drug addicts.

The biological false positive reaction to serological tests for syphilis.

Acute and chronic biological false positive reactions to serological tests for syphilis are discussed. Three cases are presented, one showing an acute and one a chronic reaction, and one in which it was not possible to determine if the reaction was acute or chronic. Once a biological false positive reaction is found, serum from the patient should be tested at intervals for at least six months t...