Also known as: Blood sugar; Fasting blood sugar; FBS; Fasting blood glucose; FBG; Fasting plasma glucose; FPG; Blood glucose; Oral Glucose Tolerance Test; OGTT; GTT; Urine glucose
Formal name: Blood Glucose; Urine Glucose
Related tests: Urinalysis; Insulin; C-Peptide; A1c; Microalbumin; CMP; BMP
To determine if your blood glucose level is within a healthy range; to screen for, diagnose, and monitor high blood glucose (hyperglycemia) or low blood glucose (hypoglycemia), diabetes, and pre-diabetes; to check for glucose in your urine
Blood glucose: as part of a regular physical, when you have symptoms suggesting hyperglycemia or hypoglycemia, and during pregnancy; if you are diabetic, self-checks up to several times a day to monitor blood glucose levels
Urine glucose: usually as part of a urinalysis
A blood sample drawn from a vein in your arm or a drop of blood from a skin prick; sometimes a random urine sample is used. Some diabetic patients may use a continuous glucose monitor, which is a small sensor wire inserted beneath the skin of the abdomen that measures blood glucose every five minutes.
In general, it is recommended that you fast - nothing to eat or drink except water - 8 hours before having a blood glucose test. In persons with diabetes, glucose levels are often checked both while fasting and after meals to provide the best control of diabetes. For random, timed, and post-meal glucose tests, follow your doctor's instructions.