Systemic immune-inflammation index (SII)
Immune system healthSII integrates neutrophil, platelet, and lymphocyte counts into a single measure of immune and inflammatory status.
Reference range
655
High normal
High
Source: Ahead Health benchmark
Reference ranges may vary between labs and assays. Always interpret results with your healthcare provider.
Why this matters
SII provides superior prognostic value compared to simpler ratios by incorporating platelet-mediated inflammation. Elevated SII predicts poor outcomes in cancer, cardiovascular disease, and severe infections.
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