Biotecan does PCR tests with results offered in English and Chinese, and also uploaded into your Health Cloud app. Tests are 40rmb and results usually available withing 12 hours. Go early to avoid the crowds. You can just show up but need to register through their bi-lingual online form. Search for Biotecan on WeChat (their Chinese name 宝藤医学 shows in the search results), click "Services" and then the first link that says 检测预约.