A doctor can measure blood glucose during an office visit. However, levels change from hour to hour and someone who visits the doctor only every few weeks won't know what his or her blood glucose is daily. The easiest test someone can do at home is a urine test. When the level of glucose in blood rises above normal, the kidneys eliminate the excess glucose in urine. Glucose in urine, therefore, reflects an excess of glucose in blood.
Urine testing is easy.
Tablets or paper strips are dipped in urine. The color change that occurs indicates whether blood glucose is too high. However, urine testing is not completely accurate because the reading reflects the level of blood glucose a few hours earlier. In addition, not everyone's kidneys are the same. Even when the amount of glucose in two people's urine is the same, their sugar levels may be different.