Which is a normal neonatal CBC range?

Which is a normal neonatal CBC range?

• A. 4.1-5.7
• B. 7.0-15.0
• C. 9.0-12.0
• D. 3.0-4.0

Answer: (A)

The main idea is recognizing which CBC component has a distinct neonatal normal range. For newborns, the red blood cell count is typically about 4.0 to 6.0 million cells per microliter. The range 4.1 to 5.7 million/µL fits squarely within that expected neonatal RBC count, so it’s considered a normal neonatal CBC range. In contrast, the other ranges don’t align with the typical neonatal RBC values: counts as high as 7.0 to 15.0 million/µL would exceed normal RBC counts for newborns, while 3.0 to 4.0 million/µL would be low for a healthy neonate. (Keep in mind CBC also includes WBC and platelet counts, which have their own neonatal norms.)

The main idea is recognizing which CBC component has a distinct neonatal normal range. For newborns, the red blood cell count is typically about 4.0 to 6.0 million cells per microliter. The range 4.1 to 5.7 million/µL fits squarely within that expected neonatal RBC count, so it’s considered a normal neonatal CBC range.

In contrast, the other ranges don’t align with the typical neonatal RBC values: counts as high as 7.0 to 15.0 million/µL would exceed normal RBC counts for newborns, while 3.0 to 4.0 million/µL would be low for a healthy neonate. (Keep in mind CBC also includes WBC and platelet counts, which have their own neonatal norms.)