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False-positive readings are obtained when the reaction does not take place under acidic conditions. Highly pigmented urine and contamination of the container with quaternary ammonium compounds, detergents and antiseptics also cause false-positive readings. A false-positive trace reading may occur in specimens with a high specific gravity.
The action of the enzyme on chemicals in the test pad ends in the creation of a purple azo dye. [54] False positive results can occur if the sample is contaminated with vaginal secretions; false negatives can occur in very concentrated samples or those containing high levels of glucose and protein. [54]
The quantity of bilirubin in patients with jaundice can be determined by the formation of azobilirubin in the presence of methanol. [2] The Van den Bergh chemical reaction which is used to measure bilirubin levels, couples bilirubin with diazotized sulfanilic acid. [2] This reaction produced azo pigments, or azobilirubin.
When Dr. Noha Aboelata learned that research stretching back decades showed that pulse oximeters routinely failed patients with darker skin, she took action.
Prompt treatment of some causes of azotemia can result in restoration of kidney function; delayed treatment may result in permanent loss of renal function. Treatment may include hemodialysis or peritoneal dialysis, medications to increase cardiac output and increase blood pressure, and the treatment of the condition that caused the azotemia.
The problem was that those devices could give false readings when a patient was moving. Kiani solved that problem by developing signal extraction technology that could distinguish between the ...
False negative tests can occur and the general expectation for antigen tests is an 80% accurate detection rate for infection, says David Cennimo, M.D., infectious disease expert and associate ...
The Griess test involves two subsequent reactions. When sulfanilamide is added, the nitrite ion reacts with it in the Griess diazotization reaction to form a diazonium salt, which then reacts with N-(1-naphthyl)ethylenediamine in an azo coupling reaction, forming a pink-red azo dye.