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NLR Formula:
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The Neutrophil Lymphocyte Ratio (NLR) is a simple calculated parameter derived from the complete blood count (CBC) that reflects the balance between neutrophil and lymphocyte counts. It serves as a marker of systemic inflammation and immune response.
The calculator uses the NLR formula:
Where:
Normal Range: NLR values between 1-3 are generally considered normal in healthy adults.
Details: NLR is increasingly recognized as a valuable prognostic marker in various clinical conditions, including cardiovascular diseases, cancers, infections, and inflammatory disorders. It provides insight into the inflammatory status and immune system balance.
Tips: Enter both neutrophil and lymphocyte counts from a complete blood count (CBC) test. Values must be greater than zero. The calculator will compute the ratio and indicate if it falls within the normal range (1-3).
Q1: What does a high NLR indicate?
A: Elevated NLR (typically >3) may indicate increased systemic inflammation, which can be associated with various conditions including infections, stress responses, or chronic inflammatory diseases.
Q2: What does a low NLR indicate?
A: Low NLR (<1) may suggest relative lymphocytosis or neutropenia, which could be associated with viral infections, certain autoimmune disorders, or bone marrow conditions.
Q3: Are there age-related variations in NLR?
A: NLR values may vary slightly with age, with some studies showing slightly higher values in older populations, but the 1-3 range is generally applicable to adults.
Q4: Can medications affect NLR?
A: Yes, certain medications like corticosteroids can affect white blood cell counts and consequently alter NLR values.
Q5: Is NLR used for diagnosis?
A: NLR is primarily used as a prognostic marker rather than a diagnostic tool. It should be interpreted in the context of clinical presentation and other laboratory findings.