The phrase "according to a fixed protocol" is correct and usable in written English.
It can be used when referring to actions or procedures that must be followed as per established guidelines or standards.
Example: "The experiment was conducted according to a fixed protocol to ensure consistent results."
Alternatives: "following a set protocol" or "in accordance with a standard procedure".
The samples were analyzed for traces of five different drugs by local labs according to a fixed protocol.
Moreover, therapy of AF was not performed according to a fixed protocol.
Acupuncture will be given according to a fixed protocol by traditional Chinese medicine practitioners educated in theoretical and practical acupuncture.
All patients participated in the Groningen Leeuwarden Ankylosing Spondylitis (GLAS) study, a prospective longitudinal observational cohort study with follow-up visits according to a fixed protocol.
For each patient, vascular imaging procedures were requested at the discretion of the treating physician, not according to a fixed protocol.
Most studies using TH for limited durations in severe TBI have not found benefits for neurological outcome, and studies involving TH for limited periods according to a fixed protocol often reported rebound increases in ICP when patients were rewarmed.
If a patient was not awake at 06:00 h on the sampling day, he or she was awakened by his or her physician or caregiver and saliva was collected according to a fixed sampling protocol [ 22].
Pharmacotherapy is given according to a fixed three-stage antidepressant protocol [ 24], which starts with the prescription of the antidepressant Venlafaxine XR 75 mg/day.
MRI scans of the brain and spinal cord were performed on a 1.5 tesla whole-body MRI (Symphony Siemens, Erlangen, Germany) according to a previously fixed protocol including T1-weighted spin-echo (SE) axial slices with and without application of gadolinium-DTPA (Gd) as well as T2-weighted SE axial slices.
MRI scans of the brain and spinal cord were performed on a 1.5 tesla whole-body MRI (Symphony Siemens, Erlangen, Germany) according to a previously fixed protocol including T1-weighted spin-echo (SE) axial slices with and without application of gadolinium-DTPA as well as T2-weighted SE axial slices.
