Quality assurance of human papillomavirus (HPV) testing in the implementation of HPV primary screening in Norway: an inter-laboratory reproducibility study

Table 3 Samples with discordant HPV test results (HPV positive, HPV negative, failed) between the four laboratories

Cytological finding	Lab A	Lab B	Lab C	Lab D
Unsatisfactory	failed	negative	negative	negative	*
NILM	failed	negative	negative	negative	*
NILM	failed	negative	failed	negative	*
NILM	negative	failed	negative	negative	*
NILM	negative	failed	negative	negative	*
NILM	negative	failed	negative	negative	*
NILM	negative	failed	negative	negative	*
NILM	negative	failed	negative	negative	*
ASCUS	positive	positive	failed	positive	*
LSIL	positive	failed	positive	positive	*
LSIL	positive	failed	positive	positive	*
LSIL	positive	positive	failed	positive	*
Unsatisfactory	negative	positive	negative	negative	**
NILM	failed	failed	negative	positive	**
NILM	positive	negative	negative	negative	**
NILM	positive	positive	negative	negative	**
NILM	positive	positive	positive	negative	**
NILM	negative	positive	negative	negative	**
NILM	negative	positive	negative	positive	**
NILM	negative	negative	negative	positive	**
NILM	negative	negative	negative	positive	**
ASCUS	negative	positive	negative	negative	**

*Samples for which at least one laboratory reported a failed result, and the women would be recalled to take a new call sample from the cervix
** True discordant samples; would lead to different clinical follow-up procedures
NILM negative for intraepithelial lesion or malignancy, ASC-US atypical squamous cells of undetermined significance, LSIL low-grade squamous intraepithelial lesion

ISSN: 1471-2334