The patient is understood to be at least the fifth case investigated in Sweden since the virus started spreading rapidly in Africa earlier this year.
They have been been transferred to the infectious diseases clinic at Karolinska University Hospital in Huddinge, according to news agency TT.
"Despite the fact that there were very low suspicions, we decided to take the test. We will get the answer within a day," Åke Örtqvist, spokesperson for doctors dealing with infectious diseases in the Stockholm region.
The sample was sent to the Public Health Agency safety laboratory.
Örtqvist would not provide any details about the potential Ebola victim due to patient confidentiality.
Ebola is a viral illness and initial symptoms can include a sudden fever, intense weakness, muscle pain and a sore throat.
The disease infects humans through close contact with infected animals, including chimpanzees, fruit bats and forest antelope.
According to the World Health Organisation, almost 3000 people are believed to have died from the virus during the latest outbreak.
Sweden's Public Health Agency has checked out at least four previous suspected Ebola cases this year.
So far, no suspected case has been confirmed.