Systemic Inflammation Response Index (SIRI)
Here’s what it reflects — and what to do about it.
Longetic pulls together every lab and record you’ve had, follows how Systemic Inflammation Response Index (SIRI) changes over time, and explains what’s shifting — so you walk into your next appointment prepared, with reminders for retests along the way.
What is Systemic Inflammation Response Index (SIRI)?
A calculated index combining neutrophils, monocytes, and lymphocytes into a single marker of systemic inflammation.
SIRI is a calculated value from a routine CBC: it multiplies your neutrophil count by your monocyte count and divides by your lymphocyte count - (neutrophils times monocytes) divided by lymphocytes. A higher SIRI can be associated with greater systemic inflammation and, in research, less favorable outcomes, a lower value can be associated with a more balanced immune state. It is a general signal, not a diagnosis.
What to know about Systemic Inflammation Response Index (SIRI)
Understanding Systemic Inflammation Response Index (SIRI) means knowing what it reflects, what tends to move it, and the signs that suggest it’s worth a closer look — so you can bring the right questions to your next appointment.
This glossary entry is for informational purposes only and is not a substitute for professional medical advice. Read our Medical Disclaimer.
References
About our sources
Official sources
Government health agencies, national institutes, and intergovernmental bodies whose guidelines carry regulatory or policy weight.
Clinical / professional
Medical societies, specialty colleges, and professional associations whose consensus statements reflect clinical practice standards.
Peer-reviewed research
Original research articles and systematic reviews published in indexed journals and verified through PubMed or DOI.