Accu-Chek Aviva Owner's Booklet page 34

Note: Do not twist the plunger when the release button is yellow or when the lancet counter shows no
white bars. This may damage the device.
11. For virtually pain-free testing, we recommend that
you advance to a new, sterile lancet after each
test. To load the next lancet, twist the plunger
one-quarter turn forward (until it stops), then twist
it back all the way.
Chapter 3: Testing Your Blood Sugar
12. The lancet counter decreases by one white bar.
For safety reasons, once you advance to a new
lancet, you cannot go back to a used lancet.
32