Patient with symptoms of high glucose levels (Hyperglycaemia) such as:
Patient with symptoms of low glucose levels (Hypoglycaemia) such as:
Patients with predisposing factors
Apart from the above examples blood sugar testing is routinely done in case of known Diabetics, in whose case blood sugar testing is done to monitor the therapy response.
Blood sugar fasting -done on overnight fasting of 8 to 10 hours
Blood sugar post meal -done 2 hour post meal
Blood sugar random-at any time of day
2 hour oral GTT (Glucose tolerance test)-After getting Fasting sugar level, patient consume 75 gm of glucose dissolved in water. After 2 hours again glucose levels are measured.
3 hour oral GTT (Glucose tolerance test)-This is done when 2 hour GTT is done and abnormal values are obtained. After a woman's fasting glucose level is measured, she is given a 100-gram glucose dose and her glucose is measured at timed intervals. If at least two of the glucose levels at fasting, 1 hour, 2 hour, or 3 hour are above a certain level, then a diagnosis of gestational diabetes is made.
Fasting blood glucose
70 to 99 mg/dL - Normal fasting glucose
100 to 125 mg/dL - Normal fasting glucose
126 mg/dL and above - Diabetes
2 hour oral GTT (Glucose tolerance test)
Less than 140 mg/dL - Normal glucose tolerance
From 140 to 199 mg/dL - Prediabetes (impaired glucose tolerance)
Equal to or greater than 200 mg/dL - Diabetes
Fasting Blood glucose - Less than or equal to 100 mg/dL
2 hour post meal - Less than 140 mg/dL
Random - 80 -120 mg/dL levels vary depending on when and how much you ate at your last meal.
HbA1c ( Glycosylated Haemoglobin ) -GOLD STANDARD of monitoring Diabetic patient over time .It provide as average Glucose level over 2 - 3 months . (link HbA1c )