In Indonesia I visited the Emergency Room. It was unplanned and not recommended. I paid an extra $1.25 for a new needle for the I.V. and asked (in Indonesian) that they open it in front of me. They didn't. Chances are fair that they just reused a needle and someone made an extra Rp12,000 that day.
As soon as (and again six months after) I got Stateside I had a battery of bloodwork and tests and everything came back negative.
I knew many American expats who had medical treatment (including giving birth) in Singapore and had no complaints.