false negative


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false negative

The erroneous identification of a benign condition that turns out to be harmful. Contrast with false positive.
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The fine needle cytology aspiration in four cases (False negative) diagnosed as nodular goiter with cystic degeneration consisted of straw colored fluid with foamy macrophages and abundant colloid were subsequently confirmed on histopathology as papillary carcinoma.
We use two logistic regression models to evaluate the characteristics of people who report false negatives and false positives in the 2011 CPS ASEC.
The study, a part of a prospective cohort study, had pooled 66 samples comprising false negative (31) and true positive (35) and found about two of every 10 will give a false negative even when the disease is present.
To achieve this goal, the ion ratios of 30 PPCPs in different matrices were determined at different concentrations in order to determine a tolerance value that is sufficient to eliminate false positives and false negatives. The matrices studied were WWTP influent and effluent samples and surface water samples from upstream and downstream of the WWTP discharge point collected from the US, Sweden, Switzerland, Hong Kong, and the Philippines, allowing the set tolerance levels to be robust, given that the composition of water samples varies significantly in different parts of the world.
However, repeated procedures or other confirmatory tests is still suggested if tubal occlusion is suspected due to possibility of false negative. Regarding to the adverse effects, other studies did not report any serious side effects.
The screening methods have limitation of false negative and positive results.
So false negative rate of test B is c/(a+c) = 10/40 = 0.25.
Touch preparations for the intraoperative evaluation of sentinel lymph nodes after neoadjuvant therapy have high false negative rates in patients with breast cancer.
The results showed an overall sensitivity of 99.0% and specificity of 99.9%, when compared with routine stool culture and independent nucleic acid-based methods without any false negative findings.