What is the normal range for red blood cell count in a healthy child?

• A. 3.8-5.0 x10^12/L
• B. 4.5-6.0 x10^12/L
• C. 2.5-4.0 x10^12/L
• D. 5.5-6.5 x10^12/L

Answer: (A)

Red blood cells carry oxygen to tissues, so a normal count reflects adequate erythropoiesis and oxygen-carrying capacity. In healthy children, the expected RBC count is roughly in the 4.0–5.5 x10^12/L range, with some variation based on age and lab references. The range 3.8–5.0 x10^12/L sits within the pediatric norm and best matches what clinicians usually consider normal for a healthy child. Values much lower would raise concern for anemia, while higher values are less typical for healthy kids and resemble adult ranges or polycythemia. So this range best aligns with pediatric norms for a normal RBC count.