Is it safe to go under anesthesia a week and a half after a very small recreational use of mda? in other words how long does it stay in your body and will it interfere with anesthesia ?

Should be: The estimates for MDMA remaining in your system is 2 days, with sensory changes long gone before it leaves the body. Such a procedure ~10 days after exposure would be fine.

Agree with Dr. F: I trust you know to not take substance of abuse. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Get HPV vaccine. Wish you good health!