Trusted blood door and corridor

[Wehmis]

Spoiler below!

From what I remember, you need the syringe and a bottle of alcohol. Neither of them was hidden very well, so you should have no problems finding them. After that clean the syringe with alcohol, and use the clean syringe to the dead doctor. Then when you have syringe filled with doctor's blood, use it to the scanner thingy in the door

Hope that helped