Table 2.

Comparison of lymphocyte subsets' reference ranges in different ethnic groups

Lymphocyte population	Reference range for population
	Chinesea		Asian (Singapore)b (n = 232) (8)	European (Germany)a (n = 100) (9)	African (n = 2,570) (18)
	Hong Kong (n = 273)	Beijing (n = 151) (11)
CD3
%	56.09–84.32	43.7–80.5	49–80	53–83
Count/μl	723–2271	711–2,353	796–2,679	780–2,240
CD4
%	28.06–53.39	22.5–55.1	23–48.2	30–59
Count/μl	396–1,309	368–1,632	401–1,451	490–1,640	365–1,571
CD8
%	16.37–42.65	11.2–43.1	13.4–41	10–40
Count/μl	224–1,014	201–931	243–1,206	170–880	145–884
CD4/8 ratio	0.71–2.82	0.63–3.49	0.69–2.83	0.9–5.0	0.7–5.3
CD19
%	7.19–25.85	4.4–21.2	7.0–28.0	5–21
Count/μl	118–645	74–534	133–714	80–490
CD56
%	3.66–26.74	3.7–46.1	6.0–37.0	5–32
Count/μl	61–607	63–1,013	115–1,009	80–690

^aReference ranges are defined as 95% of the population in these studies.

^bReference ranges are defined as 95% of the population, with the exception of CD4 and CD8 percentages, which are defined as means ± 2SD.