Having administered 30 odd nasal/throat swabs (not nasopharyngeal, just nasal), with 10 of those on myself, I'd say you'd have to be complete gibbering fuckwit in order to get it so wrong that it would be a false negative.
I did have the benefit of a nurse talking me through the first one (and standing watching me do all of the subsequent ones), but it wasn't anything other than I would have done anyway.
Lateral Flow Tests are a completely different ballgame though. Much more scope for screwing that up.
(Thanks to being part of the ONS study...)
Having administered 30 odd nasal/throat swabs (not nasopharyngeal, just nasal), with 10 of those on myself, I'd say you'd have to be complete gibbering fuckwit in order to get it so wrong that it would be a false negative.
I did have the benefit of a nurse talking me through the first one (and standing watching me do all of the subsequent ones), but it wasn't anything other than I would have done anyway.
Lateral Flow Tests are a completely different ballgame though. Much more scope for screwing that up.