The phrase "assay threshold" is correct and usable in written English.
It is typically used in scientific or technical contexts, particularly in reference to the minimum level of a substance that can be detected or measured in an assay.
Example: "The assay threshold for detecting the presence of the drug in the sample was set at 0.5 ng/mL."
Alternatives: "detection limit" or "measurement threshold".
Splenocytes from naïve mice stimulated with these antigens, and R10 controls for, were all well below the 40-spot assay threshold (data not shown).
To estimate the window period for the combined BED/Ax-AI algorithm, we took the value of the earlier of the two assay threshold crossings (BED or Ax-AI) for each individual, and then averaged across individuals.
A proportion of individuals had undetectable levels of the neurosteroid (assay threshold at ≤195 pg/ml).
Urinary albumin was measured by rate nephelometry (Array Protein System; Beckman Coulter, Fullerton, CA), with an assay threshold of 2 mg/L.
Only samples that tested above the assay threshold and demonstrated drug specificity were considered positive for anti-TPO and/or anti-romiplostim/TMP antibodies.
Further studies are required to determine if the high sensitivity of this assay threshold is maintained when applied to populations other than acetaminophen overdoses (i.e. therapeutic dosing).
For all the assays threshold cycles were converted to copy numbers using a standard curve generated by amplifying serial dilutions of an external PCR standard (10 - 10 copies).
For all the assays threshold cycles were converted to copy numbers using a standard curve generated by amplifying serial dilutions of an external PCR standard (107 - 102 copies).
However, these studies used a variety of different assays, thresholds to define elevation and measurement frequencies, and patient groups varied, making direct comparison impossible.
The TT was also used to establish the assay reactivity threshold (RT).
A sensitive RT-PCR assay (detection threshold 40 copies/ml) demonstrated that, although undetectable levels were not achieved in the 14-day dosing period, there was a 1.96 log10 median decline in plasma HIV RNA in these subjects.
