Health Secretary Jeremy Hunt has urged leading doctors to cut NHS mortality rates, which he said - for England - currently stand among the worst in Europe for respiratory diseases.
Mr Hunt told MPs there was a "wide and unacceptable" postcode lottery in the performance of NHS trusts.
He called for measurable progress in the diagnosis of life-threatening illnesses, adding that doctors would save as many as 20,000 lives a year if England was as good as the best European nation when it came to treating major diseases.
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Accompanied by the Duke of Edinburgh, the Queen will attend the opening ceremony of the fifth session in the Holyrood chamber.
Ms Leadsom has received the backing of Ian Duncan Smith, the former work and pensions secretary.
The former shadow work and pensions secretary is considered a more viable candidate than Angela Eagle, a Labour source has told ITV News.