Have you ever wondered if you’re inflamed? The answer might be hidden in your routine blood work.
When most people think of routine blood work, they often assume it’s simply a basic screening tool. A standard Complete Blood Count (CBC)—commonly ordered by family physicians—is typically used to assess for issues such as anemia, basic immune function, and even hydration. However, this basic test contains deeper layers of clinically meaningful information, particularly when it comes to inflammation.
Beyond identifying anemia or infection, the CBC allows us to derive valuable inflammatory markers such as the Neutrophil-to-Lymphocyte Ratio (NLR) and the Platelet-to-Lymphocyte Ratio (PLR).
These ratios are calculated using standard components of a CBC – neutrophils, lymphocytes and platelets.
Neutrophils are among the first immune cells to respond to inflammation, while lymphocytes help coordinate and regulate the body’s longer-term immune response. While platelets are mainly known for helping blood clot, they also help guide immune cells to sites of inflammation, supporting the body’s response to injury or stress.
What Does the Research Show?
A growing body of literature supports the clinical relevance of these ratios in states long-term stress, insulin resistance, autoimmunity and post-viral states.
NLR and PLR may be increased:
- Weight gain or having metabolic syndrome
- High blood pressure or heart disease
- Ongoing infections (like frequent colds, flu, long covid, or shingles, poor gut health)
- Chronic stress, anxiety, or depression
- Autoimmune conditions (like Hashimoto’s, rheumatoid arthritis)
NLR and PLR may be decreased:
- Weakened immune system due to illness or medications
- Low platelet counts from blood disorders
- Recovery from severe infection or surgery
Utility across conditions—but with limitations:
- While these ratios are often elevated in both acute and chronic inflammatory conditions, their ability to distinguish between specific diseases is limited. They are best viewed as non-specific but sensitive indicators of systemic inflammation, rather than diagnostic tools. (pmc.ncbi.nlm.nih.gov)
Clinical Takeaway & Bottom Line
NLR and PLR are practical, often-repeated, cost-effective markers that can flag underlying inflammation using data already available on a standard CBC. Used appropriately, they help to identify whether or not you may benefit from further evaluation.
If you or someone you know have had recent blood work or ongoing symptoms without clear answers, this is an opportunity to look deeper. These markers can provide meaningful insight into underlying inflammation and overall health patterns when interpreted alongside other blood work and relevant history.
