They accepted my card for payment when I went there in November 2016. They do basic checks which themselves don't take too long individually, but as Aniket mentions, the waiting period might take some time, so try to reach early.
They did the following checks for me: chest X-ray, eye test, pulse rate and weight. They also took blood and urine samples.
If there are issues found in the basic checks, they will send you to the neighboring departments for further tests. Nothing to worry about though - these further tests usually end up clarifying what the root cause of a problem is, and in most cases it's benign.