Sentence examples for specimens as negative from inspiring English sources

Every extraction was carried out without specimens as negative control, and we confirmed no amplification of the negative control in the PCR step.

Staining was performed with primary antibody in the spheroids and clinical specimens as negative controls.

Another approach would have been to test a separate group within experiment 3 with another 11 specimens as negative control without treatment.

POCKit falsely identified one specimen as positive for HSV-2 (unknown reason for false positive) and falsely identified eight specimens as negative for HSV-2 (due to low titre levels in the specimens).

Immunofluorescence assay of 13 randomly selected serum specimens also gave negative MERS-CoV results, supporting interpretation of EIA-negative specimens as antibody negative.

Of the 249 specimens identified as negative rRT-PCR, 248 also tested negative by RT-PCR/ESI-MS, corresponding to a specificity of 99.59% (Table 1).

This hypothesis was substantiated by a standard PCR assay using wAlbA-wsp specific primers [7] which revealed that 4 out of 5 specimens characterised as negative for wAlbA with the previously described PCR primers [11] were actually positive.

For the remaining 25 patients, both the serum specimens tested as negative for BG (range, 10 to 65 pg/mL).

In the normal lung specimens used as negative controls, the maximum number of copies of the HER-2/neu gene per cell was three, the average was 1.8 and the average ratio gene to chromosome was 1.0.

A further three misclassified all the Mtb-spiked specimens as smear-negative, thus providing the 'patients' with false negative results.

Three laboratories correctly classified all of the Mtb-spiked specimens, while three others incorrectly classified all the Mtb-spiked specimens as smear-negative.