Part 2 of our Understanding Your Labs series.
Every cell in your body needs oxygen — and every wound needs even more of it. Red blood cells (RBCs) are the delivery system. On a pre-operative CBC, the RBC count is one of the first numbers a surgeon looks at, because it directly predicts how well you will heal.
What Red Blood Cells Do
Red blood cells pick up oxygen in the lungs and deliver it to every tissue in the body, then return carrying carbon dioxide back to the lungs to be exhaled. They are also central to energy, cognition, and the repair processes that follow any surgical procedure.
Normal Ranges
- Men: 4.7 – 6.1 million cells/µL
- Women: 4.2 – 5.4 million cells/µL
Slight variation between labs is normal, and the pattern over time often matters more than a single number.
What Abnormal Means
- Too low (anemia): Fatigue, dizziness, low exercise tolerance, and — most importantly for surgery — impaired healing. Your body simply cannot deliver enough oxygen to the tissues that need it.
- Too high: May indicate dehydration, smoking, chronic lung disease, or a bone-marrow condition. Elevated RBCs can also increase clotting risk.
Low RBCs almost always have a cause — iron deficiency, B12 or folate deficiency, chronic disease, occult blood loss — and part of the pre-op work-up is identifying that cause.
Why It Matters for Surgery
The more oxygen circulating through your body, the better and faster you heal. Surgical wounds need oxygen to close, to fight off bacteria, and to remodel scar tissue. A patient with untreated anemia is starting recovery from a deficit, which increases the risk of poor wound healing, tissue loss, and complications.
Cosmetic surgery is elective. There is no reason to operate on a patient whose oxygen delivery is compromised when the issue can be corrected in a matter of weeks.
Key Takeaway
Your RBC count directly affects how well your body delivers oxygen — and how well you heal. Your surgeon wants this number optimized before you go to the operating room.
*This article is for educational purposes only and does not replace personalized medical advice. Always discuss your specific lab results with your physician.*
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