Our lab uses ELISA assays, which have been validated against in-person venipuncture draws for reliability and validity, and allows for faster results.
It's a small device you place on your shoulder that draws a tiny vial of blood. It's virtually painless and takes about 5-15 minutes to complete.
Here is a link to a video on how to use the at-home blood testing kit (For Oral TRT): https://www.youtube.com/watch?v=QsUR8mpb-hg
Here is a general how to video: https://vimeo.com/759587605