The phrase "assay negative" is correct and usable in written English.
It is typically used in medical or scientific contexts to indicate that a test or analysis did not detect the substance or condition being tested for.
Example: "The lab results came back, and the assay negative for any signs of infection."
Alternatives: "test negative" or "results negative".
Four true positive but discordant specimens were blocking assay negative using one or both EIA kits.
Table 1 Detection of results of CA72-4 in serum samples using QD-based ICTS Serum samples ICTS Validity (95 % CI) Positive Negative Total Roche assay positive (n = 70) 70 0 70 Sensitivity 100%% (91 100) Roche assay negative (n = 30) 0 30 30 Sensitivity 100%% (91 100).
The detection limit (LoD), at which a low level of sIgE should be reliably detected, was estimated as the mean plus two standard deviations of the assay negative control (Table 1).
In each PCR assay, negative and positive controls were included.
An assay negative control was carried out using non-transfected cells incubated with 100 nM peptide.
In every assay, negative controls as well as controls for the wild type, mutant type and heterozygote were included.
As with the previous assays, negative control rabbit IgG did not inhibit rosetting at equivalent concentrations, and parasite growth and maturation were not affected by any of the antibodies.
Here, the definition of positive records is at least one positive measurement in T cell response or MHC binding assays; negative records are data with only negative measurements.
In summary, we provide evidence for the presence of infectious prions in the brains of conventional prion-assay-negative deer orally exposed 19 months earlier to urine and feces from CWD-infected donor deer.
Here we have employed both of the latter methods to demonstrate low levels of infectious prions in clinically normal, conventional assay-negative white-tailed deer orally exposed 19 months previously to urine and feces from CWD+ deer.
For the model of antibiotic assay-negative patients, disease prevalence was 11.6% (95CI 8.2-15.0).
