Red blood cell count (RBC) — lab reference
In the reference guideAltitude, smoking, hydration, androgen therapy, and pregnancy may shift values.
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Lab-specific. Interpret with symptoms, medication effects, and differential.
Useful with MCV for mixed nutrient deficiencies and evolving anemia.
Local analyzer range governs. Review trends and collection artifacts.
Clinical action thresholds differ from statistical reference intervals.
Age, infection, immune status, and medications affect interpretation.
Use corrected reticulocyte count or production index when anemic.
Protein intake, hydration, catabolism, GI bleeding, and kidney function affect result.
Fasting and supplement abstention improve interpretability.
Confirm with microscopy; exercise, menstruation, myoglobin, and hemolysis may interfere.
Specimen choice, timing, recent seafood/supplements, provoked vs unprovoked collection, and public-health thresholds matter.
Relative percentage can mislead; review absolute count.
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