Table 1.

Rapid diagnostic test (RDT) sensitivity by parasite density, Rufiji District, Tanzania, December 2007–October 2008 (3,914 blood smears reviewed, 1,577 positive blood smears)

Number of positive blood smears (% of total)	Parasite density per 200 WBC*	Parasite density per µL	Sensitivity (%)
44 (2.8)	1–4	40–160	79.5
182 (11.5)	5–20	200–800	72.0
133 (8.4)	21–50	840–2,000	85.0
147 (9.3)	51–100	2,040–4,000	88.4
357 (22.6)	101–500	4,040–20,000	92.7
714 (45.3)	> 500	> 20,000	96.8
Total = 1,577 (100)	1–> 500	40–> 20,000	90.7

^*WBC = white blood cell.