NEW YORK - US Secretary of State Hillary Clinton was hospitalised Sunday for a blood clot stemming from a recent concussion, the State Department said in a statement.State Department senior adviser Philippe Reines said Clinton was being treated with anti-coagulants at New York-Presbyterian Hospital. She is to be monitored at the hospital for 48 hours, he said. “Her doctors will continue to assess her condition, including other issues associated with her concussion,” he said. “They will determine if any further action is required.” Reines said the clot was found by doctors during a follow-up exam related to the concussion she suffered early this month, her spokesman said.Clinton, 65, was injured when she fainted due to dehydration related to a stomach virus.AFP adds: Reines did not elaborate further on her condition, and would not specify where the clot had formed. Previously in 1998, when she was first lady in the White House of her husband and then-president Bill Clinton, Clinton suffered a blood clot in her leg that she has described as “the most significant health scare I’ve ever had.” “That was scary because you have to treat it immediately - you don’t want to take the risk that it will break loose and travel to your brain, or your heart or your lungs,” she told the New York Daily News in October 2007.Clinton has been off work since her return from her last foreign trip on December 7, although her staff has said she has been working from home. Only a few days ago, Reines said she was expected back in Washington this week.Her rare and lengthy absence from public life had sparked claims from some of her fiercer critics that she was trying to avoid testifying before lawmakers investigating a deadly attack on a US mission in Libya.The American media have also been rife with speculation and rumours about her whereabouts and her condition, but it is not believed to be life-threatening.Clinton’s doctors said she had become severely dehydrated due to the effects of the stomach bug and fainted, suffering a concussion. They recommended she stay off work, and ordered her not to fly until at least mid-January.Clinton has flown almost a million miles since taking office four years ago, visited 112 countries and spent some 400 days in a plane. She has been hugely popular as secretary of state, and has the highest ratings of any cabinet member.Many believe she will try to run again for the White House in 2016, after she was narrowly defeated to the Democratic Party nomination by Barack Obama in 2008.The secretary’s health prevented her from testifying on December 20 to US lawmakers about the September 11 attack on the US consulate in the eastern Libyan city of Benghazi.The assault, in which the US ambassador and three other American officials were killed, sparked a political firestorm in the United States.Republican lawmakers and some media outlets opposed to the administration slammed Clinton’s absence from the hearings, with her harshest critics suggesting she was faking illness.Republican Senator Lindsey Graham said Sunday it was “absolutely essential that she’d testify. I want to know from the secretary of state’s point of view, were you informed of the deteriorating security situation?”Graham also told Fox News Sunday Republicans would not conduct the nomination hearings for Senator John Kerry, tapped to replace Clinton, until she has appeared before them.“I’ve been told by Senator Kerry he wants that approach also. He needs to hear what she says so he can make comments about, ‘I agree with her/I don’t agree with her.’ It makes sense to have her go first.”