Wǒ zhǎo le ge dàipǎo bāng wǒ qù yīyuàn qǔ huàyàndān.
I hired an errand-runner to pick up my lab results from the hospital.
Tips
usage
代跑 is a modern gig-economy coinage - 代 (on behalf of) + 跑 (run around). Used by platforms like 闪送 and 美团跑腿 where a courier runs physical errands (pick up documents, deliver gifts) for a fee. Overlaps heavily with 跑腿.