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Blood Sugar Random

About the test
What is this test done for?
This test measures the amount of sugar (glucose) in blood, irrespective of fasting or having consumed food or drinks.
Why is it Done?

It is performed in certain situations; e.g., when fasting was not possible, a diabetic person is symptomatic, blood has been drawn for some other test (for which fasting was not required) and high glucose levels are to be ruled out in the same sample. This test is not a routine screening test for diabetes but is performed for the following reasons:

  • To evaluate whether a person is suffering from diabetes, if he is showing diabetes symptoms-
    • frequent urination (particularly at night)
    • Giddiness (frequent episodes)
    • Delay in healing of wounds or pus formation at the site of wounds
    • Repeated infections
    • Increased appetite/thirst/frequency of urinating

As a part of healthcare screening in those above 40 years.

When should it be performed?

The test is typically performed under following situations:

In a known diabetic:

  • when there are symptoms of low or high blood glucose levels
  • to differentiate the cause, when there are symptoms which are common for both high blood glucose and low blood glucose conditions (e.g., feeling better after eating food, feeling weak, dizziness).
  • To monitor the effectiveness of the ongoing treatment at any point of time.

When the doctor suspects diabetes in person with:

  • Family history of diabetes
  • High risk of diabetes
  • Obese persons
  • Symptoms of diabetes
  • persons with high blood pressure and heart diseases
How is it done
A sample is drawn from a vein in your arm. Fasting is not needed prior to sample collection.

Blood Sugar levels below 70 mg/dL

  • Indicates very low levels of sugars also known as hypoglycemia, it can happen due to:
    • Excessive dose of insulin or diabetes drugs,
    • Starving for more than 12 hours with poor intake of food
    • Heavy exercises

Blood Sugar below 110 mg/dL

  • It indicates a normal range of sugar
    • Non-diabetic person
    • Well controlled diabetic patient

Blood Sugar above 110 mg/dL

  • It indicates high blood sugar levels that are seen in
    • Diabetic patients
    • People with less than 8 hours of fasting
    • Pre-diabetic patients

Blood Sugar above 200 mg/dL

  • It indicates very high blood sugar levels, suggesting
    • Poorly controlled diabetes
    • If the person has been tested for first time, it would mean that the person has diabetes.
Other Tests

After finding abnormal results in this test other tests will be needed to establish the diagnosis of diabetes and to differentiate the types of diabetes.

  • Blood sugar fasting:
    • Blood sugar levels checked after 12 hours of fasting (overnight)
  • Blood sugar post-lunch
    • Blood sugar levels checked after 2 hours of lunch (heavy meals)


  • Blood glucose post-sugar (glucose tolerance test)
    • Blood sugar levels are evaluated after giving a certain amount of glucose solution (usually 75 g glucose drink)
    • It helps in confirming diabetes (especially in pregnant women).
  • Glycosylated hemoglobin (HbA1c)
    • It helps to elucidate average sugar levels of the last 90 days
    • It helps in confirming diabetes as well as in monitoring the treatment of diabetes.
  • Blood insulin levels (fasting and post-lunch)
    • This test is done for differentiating the type of diabetes, i.e., type 1 or type 2 diabetes
    • It suggests insulin levels of the blood.