These biological cut-offs take advantage of the natural variation in drug susceptibility present in non-drug-exposed HIV variants [10] and are more clinically relevant than arbitrary values for assay reproducibility.
For RT-qPCR measurements, calibration-curve-estimated copy number or fold changes should be reported rather than Cq, which is an arbitrary measure, and assay efficiency should ideally be taken into account.
This numerical prototyping allows developers to explore arbitrary architectures, materials, and assay formats, which is demonstrated here by discussing different real-world examples.
In the assay, an arbitrary floating cut point factor of 2.0 was used.
To perform statistical analysis on data groups which contained values below the point of detection of the assay, an arbitrary value one below the limit of the assay was assigned.
We assigned each assay an arbitrary grade: A (score, ≥ 90%), B (≥ 80%to9090%), C (≥ 70%to8080%), or D (< 70%), with A being the highest-quality assays in terms of reproducibility and D the lowest.
First, a straightforward activity assay using arbitrary conditions (30°C, pH 6) revealed that certain clones displayed relatively high activity (e.g. F3, B9, D2 and G7), comparable to that of a positive control and that two clones, D2 and F3, were significantly active on both pNP-Xyl p and pNP-Ara f.
Among 45 microRNAs tested there were seven microRNAs found to be positive based on luciferase assays by arbitrary cutoff of 35%reductionn.
They cannot only be used for affinity purification but also downstream for detection and assay of an arbitrary fused recombinant protein without the need for any prior knowledge of its biochemical properties.
Among the 927 RA patients, 401 (43.3%) were positive in the anti-CCP2 ELISA assay (> 25 arbitrary units (AUs)/ml; Immunoscan RA, Eurodiagnostica, Malmö, Sweden), and the remaining RA patients were anti-CCP2 negative.
