Up until about 5 years ago, home glucometers measurements related to glucose values in whole blood. An HbA1c of 7.0 corresponds to a value of about 150 mg/dL for whole blood.

Home glucometers always make their measurements on a drop of whole blood. However, the newer meters are programmed to take the whole blood measurement that they generate and convert it to a blood plasma measurement, which is 10-12% higher than the whole blood numbers. The blood plasma readings are always what the doctors' offices have used. The change in home meters programming was made so that the office and home readings would relate readily.

A HbA1c value of 7.0 converts to 172 mg/dL when it's referenced to the blood plasma scale. It is the blood plasma scale that you should now be using.

Here's a link if you wish to read more on this:

Plasma Glucose vs. Whole Blood Glucose