At both hospitals, a TST was recommended for all contacts at high risk with no history of a positive TST or IGRA test result, and who had never received a Bacillus Calmette-Guerin (BCG) vaccine, which can cause a false-positive reaction
to the TST.
A review of each patient's medical record revealed that two patients had hepatitis B virus infection, one patient had herpes zoster, and one had a false-positive reaction
of unknown cause.
As the sensitivity of the lysate is extremely high, it is imperative to rule out a false-positive reaction
caused by contamination with endotoxins or 1-glucan.
6% positivity in the endemic controls but negative reaction with the non-endemic controls indicates false-positive reaction
of a Cryptococcus antigen test owing to Pseudallescheria mycosis.
That mistake can not only strip the buffer system but also generate a false-positive reaction
Antibodies to HCV (anti-HCV) can indicate one of three possible conditions: current active infection with HCV, past infection with HCV, or a false-positive reaction
are not benign; they result in unnecessary chest x-rays, unnecessary fear and concern, and unnecessary treatment in many cases (sometimes with side effects).
The reduction of false-positive reactions
during ELISA testing of fecal specimens, by preventing unnecessary refrigeration cycles and product deterioration, has to be accompanied by proper storage and handling of the fecal specimens [9, 15]
Piperacillin-tazobactam and amoxicillin-clavulanate are usually implicated as the main contributors to false-positive reactions
The HCV-antibody screen that we offer at our medical center gives us the ability to separate probable false-positive reactions
from true-positive reactions by means of a signal-to-cutoff ratio.
in the latex agglutination test for Cryptococcus neoformans antigen.