Health training charity Education for Health surveyed 389 lead asthma nurses and 368 lead COPD nurses.
More than 250 of the lead asthma nurses had advanced roles, diagnosing asthma and conducting follow-up consultations, but a fifth of this group had no accredited training.
Of the COPD nurses, 215 had an advanced role, but half of these had no accredited training.
Around 40 per cent of nurses without accredited training reported that GPs were not always available for a second opinion when they were seeing patients.
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