Before falling ill the Queen took part in a series of high profile public events. This gallery shows her work over the past week.
An inquest has heard that the nurse who transferred a prank call about the Duchess of Cambridge was found hanging in her nurses' quarters.
Jacintha Saldanha's colleagues discovered her hanged in her room in the King Edward VII's Hospital nursing quarters, her inquest has heard.
A Buckingham Palace spokeswoman has confirmed that the Queen's events that had been cancelled this week would not be reinstated.
– Spokeswoman for the Queen
Engagements cancelled or postponed this week remain so.
Next week we'll have to see, as she has only just been released from hospital.
She was due at the annual Commonwealth Observance multi-faith service at Westminster Abbey in London.
The monarch's pre-recorded video message to the family of nations will be broadcast to the 2,000-strong congregation on March 11.
Soon after leaving hospital the Queen's royal standard was raised above Buckingham Palace, indicating her first stop was her official London home.
The Queen left hospital after spending just 24 hours being treated for symptoms of gastroenteritis.
The 86-year-old monarch smiled as she said goodbye to staff as she left the King Edward VII Hospital, before she was driven away in a large Bentley.
The Queen has left the King Edward VII hospital after she was admitted on Sunday with symptoms of gastroenteritis.
The Queen is expected to leave hospital today after being admitted with symptoms of gastroenteritis, sources said.
The Queen, who is being treated in hospital for symptoms of gastroenteritis, has cancelled her engagements this week but Buckingham Palace said it was too early to say whether she would attend forthcoming events.
Here's a look at her upcoming schedule:
- On Monday, the Queen, is due to speak in front of 2,000 people at the annual Commonwealth Observance multi-faith service in Westminster Abbey in central London
- After the service, she is due to attend the Commonwealth Reception given by the Commonwealth Secretary-General at Marlborough House
- On Wednesday March 13 the Queen is due to visit Tech City, east London, with her son the Duke of York
- On Thursday March 14, the Queen and the Duke of Edinburgh are due at a service at the Guards' Chapel to commemorate the 175th anniversary of the Soldiers and Airmen's Scripture Readers Association
- On Thursday March 28, the Queen is scheduled to distribute the Royal Maundy at the Maundy Service in Christ Church Cathedral, Oxford
- In April, she turns 87 while Prince Philip's 92nd birthday is in June
The Queen continues her recovery in hospital after she was admitted with symptoms of gasrtoenteritis, Buckingham Palace said.
Britain's tallest policeman, 7 feet 2 inch PC Anthony Wallyn, was among the officers standing guard outside the Queen's London hospital tonight.
To the delight of the photographers gathered outside King Edward VII Hospital, he was partnered by the smallest officer in the Met's Westminster Borough Support Unit, PC Tony Thich, who measures 5 feet 6 inches.
PC Wallyn, who wears size 17 shoes, said he gets "100-500 requests for a photo" every day, and hopes he may be able to add one with the hospital's most notable current patient.
"It would be a nice photo," he joked of the chance to be snapped next to the 5 feet 4 inch tall monarch.
All my best wishes to Her Majesty The Queen. Along with millions of others, I wish her a speedy recovery.
PM: My best wishes to HM the Queen in hospital. I hope she makes a speedy recovery.