What is the E-U error reading and how do I fix it?

Updated 3 weeks ago by Michelle Pool

An E-U error means that the meter "thinks" that the strip it is measuring has already been Used.   Typically this just means the strip has blood placed on it before it was placed in the meter and in such it thinks the strip is Used.  If you follow the following testing order with a new sample.

Order of how to test:

1. Prick your finger

2. Place fresh unused ketone strip in meter, wait while it checks CH. When its ready it shows the code that matches vial and the droplet icon will flash. With glucose  strips, the meter shows just CH for checking then the droplet icon flashes

3. With the strip still in the meter bring the droplet on your finger to the tip of the strip, on contact it will suck the blood in via capillary action.

(You need a droplet about half the size of a matchstick head, if you do not use enough blood you will get an E-F error, F for Fill)

4. The unit will countdown and give you your result.


How did we do?