WASHINGTON (Reuters) - Secretary of State Hillary Clinton was sent to the hospital on Sunday with a blood clot stemming from a concussion she suffered earlier this month and was being assessed by doctors, a State Department spokesman said.

"In the course of a follow-up exam today, Secretary Clinton's doctors discovered a blood clot had formed, stemming from the concussion she sustained several weeks ago. She is being treated with anti-coagulants and is at NewYork-Presbyterian Hospital so that they can monitor the medication over the next 48 hours," spokesman Philippe Reines said in a statement.

"Her doctors will continue to assess her condition, including other issues associated with her concussion. They will determine if any further action is required," Reines said.

(Reporting by Andrew Quinn; Editing by Eric Walsh)