Detection Windows The window to detect the presence of a particular drug in a personâs urine is highly dependent on multiple factors, such as: Hydration-More dilute urine from high fluid intake may cause dilution of drug and therefore a negative result due to levels present but below the cutoff.
Alcohol flush reaction. Alcohol flush reaction is a condition in which an individual develops flushes or blotches associated with erythema on the face, neck, shoulders, and in some cases, the entire body after consuming alcoholic beverages.
Transient flushing is also a common side effect of alcohol, particularly in heavy drinkers. It is due to acetaldehyde, the main breakdown product of alcohol. Acetaldehyde is thought to cause flushing by stimulating release of histamine.