Questions to consider: fresh tissue samples or blood samples
Maximum acceptable time from sampling to delivery:
This question is more urgent for deceased donor tissue samples, as donors may pass at any time of the day or night, seven days a week, with little if any warning until the donor is en route.
This means that tissue samples are not always ready in good time for a FedEx pickup, or standard business day delivery.
If you restrict delivery to FedEx, you may then have long delays from the sample being placed in media/buffer to being delivered at your lab.
If your tissue samples are very time sensitive, you may therefore wish to consider using a specialist next flight out courier which, whilst more expensive, will ensure you get your tissue samples in good time.