The phrase "a certified method" is correct and usable in written English.
You can use it when referring to a method that has been officially recognized or validated by a relevant authority or organization.
Example: "The laboratory employs a certified method for testing the quality of its products to ensure compliance with industry standards."
Alternatives: "an approved method" or "a validated method".
Mass spectrometry method was employed as a certified method for accuracy.
We used a certified method to analyse glycated haemoglobin.
To the best of our knowledge, this is the largest surveillance study to assess glycaemic control in Brazil using a certified method to measure HbA1c.
Measurements of dioxin contamination in these samples were performed in one single laboratory (Carso Laboratory, Lyon, France) with a certified method using high-resolution gas chromatography/high-resolution mass spectrometry (HRGC/HRMS).
Several studies have suggested that erythrocyte EPA and DHA content (measured by a certified method as "omega-3 index") may better reflect the omega-3 PUFA status in patients than measurement in plasma and white blood cells [ 77, 78], and the low omega-3 index was described to be associated with higher mortality in patients with cardiovascular disease.
For this reason, in this work we developed a new molecular diagnostic assay, Myotonic Dystrophy SB kit, a standardized and certified method, based on the combination of Long-Polymerase Chain Reaction and Southern Blot Analysis SBAA), to better characterize the DM1 mutation in a cohort of clinically well-defined DM1 patients attending the Neuromuscular Clinic at IRCCS Policlinico San Donato.
Despite the clearance of the AIT test by the South Korea Food and Drug Administration, to the best of our knowledge this test is not widely used as a screening method – neither is it approved by the Food and Drug Administration FDAA) USA or is it a Communauté Européenne (CE) certified method for the detection of antinuclear antibodies.
Not only that, there is a certified Sebring method that is still being taught and followed.
Results meet certified method (graphite-furnace atomic absorption spectrometer, GF-AAS) well, and validate promising applicability of the proposed method in many environmental areas.
An important advantage of using an NGSP-certified method is that the laboratory can provide specific information relating HbA1c test results to both mean glycemia and outcome risks as defined in the DCCT and UKPDS (44, 147, 187).
Strengths of the solutions were designed such that a reference method (RM) was able to obtain a sufficient amount of material on filter samples in 30 min cycles; the collected filters were subsequently analyzed in an analytical laboratory using certified methods.
