Table 5.
Estimated reference ranges of white blood cell (WBC), neutrophils, lymphocytes, monocytes, eosinophils, and basophils by race and time of day.
| Parameter (×109/liter) |
Race | Morning | Evening | ||
|---|---|---|---|---|---|
| No. of subjects | Reference range | No. of subjects | Reference range | ||
| WBC | Black | 192 | 2.7–7.3 | 437 | 2.9–8.7 |
| Nonblack | 1,836 | 3.0–9.1 | 2005 | 3.9–10.9 | |
| Neutrophils | Black | 191 | 0.6–4.2 | 434 | 0.6–5.3 |
| Nonblack | 1,832 | 1.0–5.8 | 1993 | 1.6–7.4 | |
| Lymphocytes | Black | 189 | 1.0–3.0 | 428 | 1.0–3.4 |
| Nonblack | 1,831 | 0.9–3.0 | 1980 | 1.0–3.4 | |
| Monocytes | Black | 189 | 0.1–0.7 | 424 | 0.2–0.8 |
| Nonblack | 1,831 | 0.2–0.9 | 1976 | 0.2–0.9 | |
| Eosinophils | Black | 189 | 0.0–0.7 | 425 | 0.0–0.6 |
| Nonblack | 1,832 | 0.0–0.6 | 1980 | 0.0–0.5 | |
| Basophils | Black | 189 | 0.0–0.1 | 424 | 0.0–0.1 |
| Nonblack | 1,831 | 0.0–0.1 | 1975 | 0.0–0.1 | |