From the Stockholm Central station and the Airport Terminal:
Take green subway line towards Hässelby to S:t Eriksplan.
Choose the Torsgatan subway exit.
On the street, take bus number 48 or 63 to Karolinska Institute (third stop, after the bridge!).
On the busstop side of the street you enter the Karolinska hospital compound. Beyond the first building (thorasic specialities) you will find the laboratory buildings. Welcome!