Table 3.

Expected rates of false positive results and expected positive predictive values for differentRHD PCR strategies^*

	Rate of	Positive predictive value	Number of
PCR strategy	false positives	of positive result	polymorphism tested
Exon 10 only [1,2]	1:1,276	0.999216	1
Intron 4/Exon 7 [13]	1:4,081	0.999755	2
Intron 4/Exon 7/RHDψ [14]	1:4,700	0.999787	3
Intron 4/Exon 7/W16X	1:5,212	0.999808	3
Intron 4/Exon 7/Intron 7	1:6,051	0.999835	3
Exons 3, 4, 5, 6, 7, 9 [26]	1:6,051	0.999835	6
Exons 2, 3, 4, 5, 6, 7, 9, 10 [27]	1:6,051	0.999835	8
Intron 4/Exon 7/W16X/RHDψ	1:6,267	0.999840	4
All Exons/RHDψ	1:7,520	0.999867	9
Intron 4/Exon 7/Intron 7/W16X	1:8,921	0.999888	4
Intron 4/Exon 7/Intron 7/W16X/RHDψ	1:12,533	0.999920	5

^* Rates were calculated based on the population frequencies of different alleles determined in the Table 2. The exact rates are population dependent and may vary according to the prevalence of alleles in the population tested.