false positive reaction การใช้

False positive reactions can be due to unusual pigments in the urine ( for example, yellowy orange phenazopyridine metabolites, indican and the metabolites of the medicine Lodine ( Etodolac ) ).
False positive reaction can be due to the presence of other reducing substances in urine such as ascorbic acid ( during intake of vitamin supplements ), drugs ( levodopa, contrast used in radiological procedures ) and homogentisic acid ( alkaptonuria ).
When asked to comment on testimony delivered at the trial of the Birmingham Six, in which Dr . Skuse had stated that the temperature in a room in which the Griess test was conducted would need to be heated to 60 癈 to produce a false positive reaction to nitrocellulose ( and thereby confuse the reading with nitroglycerine ), one of the forensic scientists stated, " Frankly, I was amazed ."