The phrase "ascertain whether the levels" is correct and usable in written English.
It can be used when you want to determine or find out if certain levels meet specific criteria or standards.
Example: "The team was tasked to ascertain whether the levels of pollution in the river were within acceptable limits."
Alternatives: "determine if the levels" or "verify whether the levels".
2) In experiments designed to compare the level of transcripts originating from plasmids in exponentially growing cells with those in stationary phase no effort was made to ascertain whether the plasmid levels (copy numbers) remained equal at the two growth stages (most likely were not).
As past field experiments did not include people from MENA countries, it could not be ascertained whether the level of discrimination against them had changed over time.
"As such, this case has also led to a review into our anti-doping programme to ascertain whether the appropriate level of resource is being deployed and whether it is being deployed in the most effective way.
It is difficult to ascertain whether the low level of egg cortisol in cod obtained in the present study is an intrinsic factor or due to the physiological status of the female spawners because the condition of the spawners was not assessed in the study.
The RT-PCR assay was used to ascertain whether the mRNA level of MDR1 was up-regulated in the K562-imatinib cells compared with the K562 cells.
This procedure compared subsequent timepoints with the earliest timepoint, to ascertain whether the expression level of the probeset was either stably (↑ or ↓, Figure 4) or transiently (↑↓ or ↓↑, Figure 4) altered.
In our study (as in other studies on antibody levels and glioma risk), it is difficult to ascertain whether the lower IgG levels were present before the development of the tumor or whether these levels may be a product of the process of gliomagenesis.
The primary objective of this study was to ascertain whether the Threshold Alkali Level (TAL) of the concrete aggregates may be taken as a suitable reactivity parameter for the selection of aggregates susceptible of alkali-silica reaction (ASR), even when ASR expansion in concrete develops under restrained conditions.
To ascertain whether the variation at nucleotide level resulted in change in at amino acid level, the protein sequences of vp19 gene were also compared.
Our purpose was to evaluate the role of RBCs in maintaining S1P homoeostasis, to determine how RBC transfusion affects S1P levels and to ascertain whether the relationship between RBC transfusion and S1P levels is itself influenced by RBC storage duration.
