Complex sentence: Smaller drop volumes have enabled "alternate site testing"--pricking the forearms or other less sensitive areas instead of the middle of the fingertips; pricking the sides of the fingertips is actually the least uncomfortable method of testing.
Split into simpler sentences: Smaller drop volumes have enabled "alternate site testing"--pricking the forearms or other less sensitive areas instead of the middle of the fingertips. However, pricking the sides of the fingertips is actually the least uncomfortable method of testing.