The phrase "a gray zone of" is correct and usable in written English.
It can be used to describe an area or situation that is ambiguous, unclear, or not easily categorized, often in moral, legal, or ethical contexts.
Example: "The debate over privacy rights in the digital age exists in a gray zone of conflicting interests between security and personal freedom."
Alternatives: "an ambiguous area of" or "a murky space of".
Many of their books enter a gray zone of shady credibility.
But until now sterilization, including vasectomy, has slumbered in a gray zone of dubious legality, one that appears to accommodate the apprehensions of French males.
Nevertheless, there are too many cases where the government's involvement in the case traverses into a gray zone of leading, rather than following, the crime.
I remember the feeling distinctly: a dense cloud of agita settling over me, a needling sensation of entering a gray zone of medical decision-making.
Tarasyuk noted that NATO's enlargement to include states such as Poland and Hungary would prompt a negative reaction from Moscow — and also raise a dilemma for Kiev: how could Ukraine avoid becoming a gray zone of insecurity, or a borderland, between an enlarged NATO and Russia?
Obtaining an urban residence permit, called a hukou, is possible only for those with deep pockets or top-notch connections, so struggling migrants live in a gray zone of pay-as-you-go medical care, dingy rented rooms and unregistered schools where the education is middling at best.
It has some similarities with the idea of a "gray zone" for neonatal treatment decisions (American Academy of Pediatrics Committee on Fetus and Newborn 2007; Harrison 2008).
Indeed, cancers underdiagnosed by SB, and well detected by mp-MRI guided TB are located in a "gray zone" composed of the anterior part of the transition zone (TZ), the AFMS, the lateral and anterior horns and extreme parts of the peripheral zone (PZ) [ 12, 38, 39].
Sixteen patients had a PSA value between 4 and 10, considered as a "gray zone," and 12 of these had a positive UCF DNA result, with a sensitivity of 0.75 (data not shown).
In our study, an Eadyn value of 0.73 predicted pressure responsiveness with a high sensitivity and specificity and a narrow gray zone of uncertainty.
However, the application of a "gray zone" approach to PPvariation for prediction of fluid responsiveness in mechanically ventilated patients identifies a range of PPvariation values (from 9%to13%3%) [ 28].
