'examination has shown' is a correct and usable phrase in written English.
You can use it to indicate the results of an investigation or a study. For example, "Examination has shown that the soil in this region is incredibly rich and fertile."
'A post mortem examination has shown that Sally died as a result of asphyxia,' he said.
Scientific examination has shown that the different coloured enamels were not in the form of powder when they were inserted into the cloisons before being fired and fused together; rather they were in the form of fragments of coloured glass.
Subsequent examination has shown that the man was short by today's standards - about 5ft 5in - and probably died in his early 20s.
Late 20th-century technical examination has shown significant differences in technique and style between the panels of individual diptychs.
(Tischendorf himself thought that the parchment had been made from antelope skins, but modern microscopic examination has shown otherwise).
Microscopic examination has shown that the mycobacteria have intact cell envelope and large lipid inclusion bodies in the cytoplasm [42].
These results, which shall be confirmed by destructive examination, have shown so far the manufacturing feasibility by powder HIPping of the Shield of ITER Primary Wall Modules.
Two hundred and fifty one children completed the oral examination having shown 'positive' or 'definitely positive' behaviour.
During an earlier evaluation, a bone marrow examination had shown active hematopoiesis, myeloid hyperplasia, and subtle myelofibrosis.
The results of a meta-analysis of CT vs. physical examination have shown that CT is more sensitive, specific and accurate than physical examination (PE) alone but not significantly so.
Colonoscopy had revealed mucosal ulcerations involving the distal ileum and right colon alternating with areas of normal-appearing mucosa and histological examination had shown transmural inflammation and epithelioid granulomas, typical of CD.
