Aregawi has agreed to the suspension and has requested that the IAAF analyse the so-called B-sample to verify whether the first sample was indeed positive.
"We are stunned and disappointed that we have to make this statement," the head of the Swedish Athletic Association, Stefan Olsson, writes in a press release Monday.
Olsson adds that they are unable to make further comments because the process is confidential.
The captain of Sweden's Athletics Federation, Karin Torneklint, tells Swedish Radio's sports department that it is important to remember that these are still allegations.
"I feel disheartened and sad hearing about this, but it is important to remember that she has not been convicted of anything yet," Torneklint says.
Aregawi is the reigning world champion over 1500 metres and has won two world titles for Sweden. She became a Swedish citizen in 2012.