Blood Sugar Fasting Test

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Sample Type

Blood

Recommended for

Male, Female

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Within 24 Hours

Blood test at Home

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Test Overview

Blood glucose (sugar) is derived from food and it is the main source of energy. If a person has high blood glucose level then this condition is known as diabetes while if it is low it is known as hypoglycemia.
Diabetic patients should monitor their glucose or HbA1c levels regularly to evaluate control of blood glucose in body.
Diabetes mellitus, commonly known as diabetes, is a group of metabolic disorders characterized by a high blood sugar level (hyperglycemia) over a prolonged period of time.
Symptoms often include frequent urination, increased thirst and increased appetite. If left untreated, diabetes can cause many health complications.

Why is this test done

This test is done to diagnose patients suspected to be suffering from diabetes or hypoglycemia. This test can be done in fasting state, post glucose intake (post-prandial) or randomly. It is also done to diagnose diabetes during pregnancy (gestational diabetes). Though HbA1c is a preferred test to diagnose diabetes due to several advantages but blood glucose estimation is the test of choice for diagnosis in patients of hemoglobin variants, sickle cell anemia, pregnancy (2nd & 3rd trimester), postpartum (immediately after pregnancy), G6PD deficiency, HIV, hemodialysis, recent blood loss, transfusion or erythropoeitin therapy. In the above mentioned cases HbA1c is not used to diagnose diabetes

What does it measure

This test measures blood glucose levels in plasma of the patient

What to expect during the test

This test requires a blood sample. A tourniquet (elastic) band is placed tightly on the upper arm. The patient is then asked to make a fist. This helps in the build-up of blood filling the veins. The skin is disinfected before needle insertion and the blood sample is collected in vacutainer.

What if results are Present/ Absent

Result values considered normal or abnormal differ basis type of test done i.e., random, fasting, post-prandial
Fasting blood sugar:
Hypoglycemia: <70 mg/ dL; Normal: 70-99 mg/dL; Impaired: 100-125 mg/ dL; Diabetes: 126 and above
Post-prandial/ Random:
Normal: 139 mg/ dL and less; Impaired: 140-199 mg/ dL; Diabetes: 200 and above

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