"not well controlled" is correct and usable in written English.
You can use it to describe a situation or process that is not working as intended. For example, "The experiment was not well controlled, and the results were inconclusive."
"In cases where the diet is not well controlled, the benefits may easily outweigh the potential risks," Ms. Schuett wrote.
Ms. Santiago does not work: She has epilepsy, and her seizures are not well controlled by medication.
The retransmission range is not well controlled.
This means that when corrosion conditions are not well controlled, dummies with a variation in corrosion states are obtained.
The morphology and size distribution of as-synthesized nanoparticles are not well controlled in most of these processes.
Blood pressure (BP) is not well controlled in the majority of patients with both diabetes and hypertension.
The positions of measurement points were thus not well controlled with reference to bathymetric and geological features and/or biological activities.
Although intra-abdominal pressure reduction with percutaneous drainage temporarily improved respiratory status, circulatory impairment persisted and infections were not well controlled.
Contrary, in the other two museums the differences between outdoor/indoor values for the relative humidity are small indicating that the indoor conditions are not well controlled.
High blood pressure, cholesterol and blood sugar suggest the patient's diabetes is not well controlled and can lead to complications such as kidney failure and stroke.
Unfortunately, the process is insufficiently studied until now and the conditions under which the cells are sold and used are not well controlled.
