The A1C test is a blood test used to measure the average level of glucose in the blood over the last two to three months, and is used as a means of checking how well blood sugar levels are being controlled for a person with diabetes.ore detail and supporting information is in the body of this article. 1  A1C is an abbreviation for glycated hemoglobin, which forms when glucose attaches to a protein in red blood cells. 2  As blood glucose levels rise, so does the percentage of glycated hemoglobin, so A1C is used to measure diabetes control.
Note: To see if multiple ratios are proportional, you could write them as fractions, reduce them, and compare them. If the reduced fractions are all the same, then you have proportional ratios.
Identify the constant of proportionality by writing an equation in the form y=mx. In this lesson you will learn how to identify the constant of proportionality in verbal descriptions of proportional relationships by writing an equation of the form y = mx and solving for m. 1  Created By: Liza Cope. 2  Standards: 7.RP.A.2b.