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Last night the local news bulletin on the BBC had a segment on the poor rate of diagnosis of dementia in the south west. A striking feature of the report and the various speakers involved in commenting on the situation was the variability in the pronunciation of diagnose. Instances of the word were coming so thick and fast that I really did not have time to do a count, but my impression was it was evenly split between ˈdaɪəɡnəʊz and ˌdaɪəɡˈnəʊz.
LPD has a pronunciation preference result for this word (1993), but only for US English, at least in the only edition I can lay my hands on at the moment. The poll came out approximately 60/40 in favour of final primary stress for the word.
Wiktionary only gives stress on the final syllable
diagnose
Murray’s OED December 1895 sole recorded form appears as such to this day, now shown in OED3 as /daɪəɡˈnəʊz/. Jones in EPD1 in 1917 gave preference to a front-stressed version adding Murray’s as a variant but not with any suggestion that it was rare. This judgment remained unaltered by Gimson in 1977. EPD 15 in 1997 also concurred but the newly incorporated EPD US versions were both only end-stressed, the former having final /-s/ and the latter /-z/. The current EPD 18 has added to these the alternative of US front stressing.
Wells’s LPD1 of 1990 entry was in line with EPD 1917-77 except For adding the possibility of final /-s/ but for LPD2 he was able to a profit from the information provided by a 1993 pronunciation preferences poll carried out by Yuko Shitara on US usages which clearly pointed to predominance of late-stress and final /-s/ forms there.
Here are some versions as far as possible as heard online
Versions in SQUARE BRACKETS are as heard to contrast with transcriptions supplied
Cam ALD /ˈdaɪəgnəʊz/ [ 'daɪəg`nəʊz] $ daɪəgnəʊz [`daɪɪgnəʊs]
Collins (ˈdaɪəɡˌnəʊz) ['daɪgˎnəʊz]
Howjsay diagnose ie no phonetics `daɪəgnəʊz
MacMillan /’daɪəgnəʊz/
MWeb Learners /ˈdajəgˌnoʊs/
MWeb Online \ˈdī-ig-ˌnōs, -ˌnōz, ˌdī-ig-ˈ, -əg-\[`daɪ.ɪg`nous]
Oxf Adv Am Dict /ˈdaɪəɡˌnoʊs; ˌdaɪəɡ[ˈnoʊs]/
Oxf ALD ˈdaɪəɡnəʊz ˌdaɪəɡˈnəʊz $ ˌdaɪ[ə]ɡˈnoʊs
Vocabulary.com daɪ.ᵻg`noʊs
Wiktionary IPA: /daɪəɡˈnəʊz/ no spoken version found