All lab markers

Blood count

RBC

RBC is tracked as part of blood count. Lower results are the ones to watch. A common adult reference interval is 3.8–5.8 M/uL.

Typical adult range

Reference interval
3.8–5.8 M/uL
Often-cited tighter window
4.2–5.2 M/uL

Standard adult laboratory reference interval. Your own lab's printed range is the one that applies to your result.

What commonly moves it

  • Iron deficiencyLow stores or poor delivery limit red-cell production and thyroid conversion.
  • Reticulocytes Absolute

These are commonly described physiological relationships, shared for education. They are not a diagnosis and cannot account for your medications, history, or symptoms — discuss your results with a licensed clinician.

Watching RBC over time?

Dose Compass charts each draw, flags meaningful moves, and helps you prepare questions for your clinician.

Start tracking