'It is not usual practice' is a grammatically correct and usable phrase in written English.
You can use it when you want to express the idea that something is not normally done or accepted. For example: "It is not usual practice to wear a suit to the beach, so I left mine at home."
Due to the difficulty in performing extensive tests on each patient dose (batch) produced, it is not usual practice to obtain a certificate of analysis.
For the majority of community gastroenterologists and hepatologists it is not usual practice (or necessarily easy) to get tissue diagnosis when managing patients with presentations such as AIP.
In Scandinavian countries it is not usual practice to wash the sauna, but rather accompany oneself with the proper equipment to prevent contamination of the sauna.
Opposition Leader Bill Shorten acknowledged her forensic passion for the practice of the House while Labor's Tony Burke reminded the Parliament that it was not usual practice for the executive government - nay the prime minister - to appoint the Speaker, as Abbott did.
In acute hospitals in the UK it is not usual clinical practice to assess routinely whether people with dementia are in pain.
In most of the hospitals in South East Asia, having a multidisciplinary group responsible for guideline development, as is recommended by evidence-based guideline development methods, was not usual practice, nor was it explicitly valued.
None of the patients received prone positioning as this was not usual practice for our ICU during the study period.
Senior Doctor Having a multidisciplinary group responsible for guideline development, as is recommended by evidence-based guideline development methods, was not usual practice at most SEA-ORCHID hospitals.
A 'workaround' was defined as any action taken by RCF staff that was not usual practice for medication administration at the RCF (eg, using a copy of a hospital inpatient medication chart or administering medications without a medication chart).
However, intraductal biopsy, which often requires a biliary sphincterotomy (Ponchon et al, 1995), and EUS-guided FNA of strictures are technically challenging procedures with a higher risk of complications than brush cytology and therefore are not usual practice in our unit or at other centres (Lee, 2006) when acquiring tissue for the first time.
15 However, it is not usual in general practice to make formal assessments of patient-reported global health, and so a significant response was considered to be one that justified the diagnosis, resulting in continued treatment.
