TABLE 2.

Diagnostic yield in relation to number of PCR tests requested

No. of PCR tests requested	No. of specimensa	No. of PCR tests		% Positive
		Performed	Positive
1	1,202	873	29	3.3
2	248	459	38	8.3
3	123	349	14b	4.0
4	56	221	4	1.8
5	24	119	2	1.7
6	6	36	0	0
Total	1,659	2,057	87	4.2

^aAll CSF specimens had an HSV PCR requested (n = 1,659), and 457 had an additional PCR requested.

^bIncludes a patient with EBV and JC virus coinfection.