Fasting blood glucose: A test to determine how much glucose (sugar) is in a blood sample after an overnight fast. The fasting blood glucose test is commonly used to detect diabetes mellitus. A blood sample is taken in a lab, physician’s office, or hospital. The test is done in the morning, before the person has eaten. The normal range for blood glucose is 70 to 100 mg/dl.
Why Get Tested:
- This test is done to diagnose diabetes mellitus.
- This test is also done to evaluate and monitoring of the patient with diabetes mellitus.
- This test is also done to detect and diagnose diabetes and prediabetes and to control high blood glucose (hyperglycemia) or low blood glucose (hypoglycemia)
When to Get Tested:
- when you are older than 45 and every three years.
- When you have risk factors for diabetes.
- when you have symptoms suggesting high or low blood glucose.
- During pregnancy.
Test Preparation Needed :
Recommended that you fast (nothing to eat or drink except water) for at least 10 – 12 hours before having a blood glucose test.
- This test can be done on Serum. The serum should be separated within 30 minutes of collection.
- The serum can be stored at 25° C for 8 hours and 72 hours at 4 °C.
- Oxalate blood can also be used. Preservative sodium fluoride may be added.
- The plasma can be stored at 25 °C for 24 hours (when there is preservative sodium fluoride).
- Adult = 74 to 106 mg/dL (4.5 to 5.9 mmol/L)
- Children = 60 to 100 mg/dL (3.5 to 5.6 mmol/L)
Raised glucose level (Hyperglycemia) seen in:
- Diabetes mellitus, adult and juvenile.
- Physiological causes.
- Strenuous exercise.
- Strong emotions.
- Shock and burns.
- Endocrine disorders.
- Acromegaly and gigantism.
- Cushing’s syndrome.
- Pancreatic diseases.
- Acute and chronic pancreatitis.
- Pancreatitis due to mumps.
- Cystic fibrosis.
- Pancreatic cancers.
- other causes are: