The phrase "a low level before" is grammatically correct and can be used in written English.
It can be used in contexts where you are discussing a state or condition that was previously at a low level, often in relation to measurements or performance.
Example: "The system was operating at a low level before the upgrades were implemented."
Alternatives: "a previous low level" or "a lower level earlier".
The transcript of Arabidopsis RPM1 remains at a low level before and after pathogen attack; however, the RPM1 protein is degraded during HR [ 101].
LFY expression is observed at a low level before flowering, in the lateral primordia that develop into leaves, and increases in successive lateral primordia during the floral transition, and the level of LFY expression in lateral organs is a major determinant in the transition from shoot to floral fate.
Despite inconsistent use of vector and larval control in the reviewed studies, the vast majority of successful campaigns used co-interventions to bring malaria incidence down to a low level before attempting to interrupt transmission with MDA, or both interventions were initiated simultaneously.
listening to your favorite Metallica records at max volume, this can do damage to property and worse, Test the volume out at a low level before seeing how far you might want to push it.
The Rhodesian Bush War (or Second Chimurenga), which had been underway at a low level since before UDI, began in earnest in December 1972 when ZANLA attacked farms in north-eastern Rhodesia.
Interestingly, the experiments described above revealed that CD34+ progenitors with CD10 still had C/Ebpα gene expression, and CD34+ CD10Lo progenitors expressed MPO at a low level, as reported before [27], [29].
Overall, participants exhibited a low level of independence before randomisation, with mean Barthel index scores of 11.1 and 12.5 in the intervention and control groups, respectively (table 5).
Emotional functioning scale showed a low level one day before prostatectomy (78.2) and a significant higher score (90.4) during follow-up independent of age (all p < 0.05 Student's t-test).
The dependency ratio the number of people of non-working age, both young and old, as a proportion of those of working age will bottom out between 2012 and 2015 at an exceptionally low level before rebounding, says a report by the Chinese Academy of Social Sciences.
The crew was on a low level terrain avoidance night mission, before SAC stopped such flights, and had just entered low altitude and were calibrating their terrain avoidance radar, when they flew too low, clipped the tops of the forest and crashed.
During the recovery phase, the magnetic flux was virtually constant at a low level, about the same as that before the substorm.
