First, I would like to mention that I know doctors, lawyers, and even judges who have been arrested on suspicion of DUI, and they are still employed. If you are an attorney who is worried about discipline from the DC Bar, a DUI is generally not considered a crime of moral turpitude that would lead to discipline. However it is best to consult the DC Code of Professional Conduct as to your particular situation.
The most important thing to remember is that an arrest for DUI is a not a conviction, and there is a lot that can be done to help your situation. If it is your first offense of any kind, your lawyer may be able to negotiate a deferred sentencing agreement (DSA), where the charge can be dismissed if you comply with the requirements of probation. If you are not eligible for a DSA, your DC DUI lawyer can discuss the many other options that may prevent a conviction.