Can my regular ob-gyn test my ascites for cancer cells in the office, or does it have to be done in a surgical type environment? it's a new symptom.

Yes,need cytology : Yes , can collect fluid in preservative , and send to cytology lab, some office will such labs in the same facility . Speak to your doctor, .

No.: Typically, ascites can be checked by inserting a needle through the abdominal wall under ultrasound guidance. This is usually done in the radiology department rather than in the ob-gyn office.