Sentence examples for specimens are negative from inspiring English sources

In cases where stool and urine specimens are negative, biopsy specimens from the gut mucosa can be examined for the presence and viability of trapped eggs in tissue crush preparations or in stained paraffin sections.

Usually when an organism is isolated from a blood culture specimen, blood cultures are repeated every 24 hr till two blood culture specimens are negative for organisms.

Patients are then considered candidates for further ablative therapy of flat areas of dysplasia if biopsies and EMR specimens are negative for intramucosal cancer without evidence of submucosal invasion.

Additional precautions are continued until weekly rectal swab specimens are negative over 4 weeks, at which point patients are placed in private rooms with ongoing periodic screening for 6 months.

Moreover, all 51 liver specimens were negative for both HBsAg and HBcAg.

Results: Overall, 91 (30.3%) specimens were positive and 204 (68.0%) specimens were negative for HSV by both LightCycler assays.

A large prospective analysis showed that 94.8 95.5% of S-OIV positive specimens were negative by seasonal H1/H3 subtyping.

DNA samples from normal controls (n = 180 cell lines, n = 15 DBS, and n = 88 buccal specimens) were negative for the deletion.

None of the PCR-positive specimens were negative by histopathology.

All 67 specimens were negative when tested by IS2404 PCR.

Patients whose specimens were negative for P. jirovecii served as controls.