We used MD Link BVI Concierge Testing last Tuesday morning because they come to wherever you are. We were in Trellis and dinghied in to meet the nurse. Expensive ($125 pp), but we didn't want to return to Roadtown a day early. We also had heard (here on TTOL) that the clinic on JVD was not turning around test results in a timely manner. We got our results while we waited on shore and had email confirmations within the hour.