What does an elevated neutrophil-to-lymphocyte ratio (NLR) indicate?
An elevated neutrophil-to-lymphocyte ratio (NLR) greater than 3.5 in an acutely ill patient suggests a bacterial infection with a sensitivity of approximately 75–80%. While it is a useful diagnostic marker, it is not definitive, and values below 3.5, especially in the context of elevated total white blood cells, strongly indicate a viral infection.
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