Table 3

 Outcome of fourth round of proficiency testing

SampleReferenceLaboratory
12345678910
DNA denotes high molecular weight isolated DNA. Par indicates that the tube contained one or two 3–4 μm paraffin wax embedded section(s) and Glass denotes a paraffin wax embedded section on a coated glass slide; each sample from the same patient contains the same letter (A or B). NP, no polymerase chain reaction product; ?, uncertain classification. Bold indicates discordant results.
1A DNAAAAAAAAAAA
2B DNABBBBBBBBBB
3B ParBBBBBBBBBB
4A ParAANPAAAAAAA
5A ParAANPAANPAAAA
6B ParBBNPBBBBBB A
7B ParBBBBBBBBB A
8A ParAAAAAAAAA B
9A ParAANPAAAAAA B
10B ParBBBBBBBBBB
11A GlassAANPAAAAA B? A
12B GlassBBNPBBBBBBB