Queen Elizabeth was hospitalized for 'preliminary investigations'

Queen Elizabeth was hospitalized Wednesday night for "preliminary investigations," a Buckingham Palace spokesman confirmed to ABC News.

The queen was back at her desk at Windsor Castle by Thursday afternoon and undertaking light duties.

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No other details about the queen's condition are currently available.

"Following medical advice to rest for a few days, The Queen attended hospital on Wednesday afternoon for some preliminary investigations," the palace said in a statement. "[She] remains in good spirits."

Queen Elizabeth, 95, hosted a reception for leaders, including Bill Gates and John Kerry, at Windsor Castle on Tuesday.

The next day she was forced to cancel a trip to Northern Island as her medical team advised her to get some rest.