• Test Code - PL0112
  • Test Name - Plasma Blood Sugar Fasting
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Test Details & Preparation


  • Fasting Blood Sugar test is done to determine if your blood glucose level is within a healthy range to screen for and diagnose diabetes and pre-diabetes and to monitor for high blood glucose (hyperglycaemia) or low blood glucose (hypoglycaemia) to check for glucose in your urine.

  • Fasting Blood Sugar test is performed when you are older than 45 years or have risk factors for diabetes when you have symptoms suggesting high or low blood glucose during pregnancy when you are diabetic, self-checks up to several times a day to monitor blood glucose levels.

  • Urine glucose test is performed 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 diabetics may use a continuous glucose monitor, which uses a small sensor wire inserted beneath the skin of the abdomen to measure blood glucose at frequent intervals and provides a result.

  • In general, it is recommended that you fast (nothing to eat or drink except water) for at least 8 hours before having a blood glucose test. For people 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 health practitioner's instructions.

  • High levels of glucose most frequently indicate diabetes, but many other diseases and conditions can also cause elevated blood glucose.

  • In a person with signs and symptoms of diabetes or hyperglycaemia, a non-fasting glucose level (random blood sample) that is equal to or greater than 200 mg/dL (11.1 mmol/L) indicates diabetes.

  • A low level of glucose may indicate hypoglycaemia, a condition characterised by a drop in blood glucose to a level where first it causes nervous system symptoms (sweating, palpitations, hunger, trembling, and anxiety), then begins to affect the brain (causing confusion, hallucinations, blurred vision, and sometimes even coma and death).


Diseases for which this test is required

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