Accident and emergency departments in Scotland's hospitals have missed a key waiting time target, with seven health boards falling short.

A total of 93.9% of all patients were seen and either admitted, transferred or discharged within four hours in the week ending November 1, below the Scottish Government's interim target of 95%.

NHS Ayrshire and Arran had the poorest performance on 87.6%, while Borders, Fife, Forth Valley, Greater Glasgow and Clyde, Lanarkshire and Lothian health boards also missed the standard.

The lowest ranked accident and emergency site was University Hospital Ayr (83.7%), with Glasgow's Queen Elizabeth University Hospital also lagging on 86%.

Performance at Scotland's newest hospital has improved from a record low of 77% in October but has consistently fallen below the 95% target.

Labour's public services spokeswoman Jackie Baillie MSP said: "The problems at this £850 million flagship hospital are now quite clear.

"It is seriously struggling to hit A&E targets in the autumn, which does not bode well for patient care in the winter.

"We are hearing stories of staff in tears and sick with stress. This is not what our NHS in 2015 should look like.

"Scottish Labour asked SNP Health Minister Shona Robison back in May to pause the transfer of patients and consider issues of capacity. Our pleas fell on deaf ears."

Ms Robison said the latest national figure was three percentage points higher than the same period last year.

She said: "As we prepare to head into winter we have been working closely with health boards and stakeholders to put further measures in place.

"This includes our winter guidance for boards, which was issued two months earlier this year compared to previous years, and additional investment of £10.7 million which will help ease pressure.

"In September we circulated guidance to boards on eliminating crowding and long waits in A&E, by ensuring best practice escalation measures are in place in each hospital.

"In addition, the national unscheduled care team continues to work closely with a number of local teams across Scotland, to monitor performance and progress the six essential actions, which aim to minimise long waits in A&E and assessment units by improving patient flow throughout all areas of the hospital and in the community.

"I am also receiving regular updates from sites experiencing challenges to ensure that progress is being made to drive down waiting times."

Ms Robison said the Scottish Government is working closely with Queen Elizabeth University Hospital to tackle any issues, and pointed out that the health board had invested £8 million to create additional capacity for winter.

She said: "I recognise there may be some variability in performance while the site continues to work through its action plan to create additional assessment capacity, but I have made it clear that we expect all necessary steps to be taken without delay to ensure the A&E and the assessment unit is resilient as we go towards winter.

"It is welcomed that the first phase of the additional capacity became available yesterday.