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Fasting is necessary for some particular blood test, but it is not always necessary, but when fasting is needed it only for a short time. The blood test result can show a difference in the result if it has done before or after fasting. One can eliminate unnecessary worries by understanding when and how to fast before a blood test.

Know why fasting is required:

When we eat food and drink alcohol, the food particles and liquid gets broken down in the stomach and get absorbed into the bloodstream. When food and alcohol are being consumed, the food and liquid gets broken down and absorbed into the bloodstream, which can affect certain substances in the blood, such as:

  • Sugar
  • Minerals, such as iron
  • Cholesterol and other fats
  • Enzymes, such as GGT

Measuring the correct levels of this substance is very crucial to diagnose many conditions.

Such as:

  • Diabetes
  • Anaemia
  • High cholesterol
  • Liver disease

It is very important that a person fasts, for the correct diagnosis of these conditions.

The test level values of particular substances in the blood may raise is that person has eaten before the test, which can lead to inaccurate or incorrect results, which can lead to a wrong diagnosis in tests.

Blood tests that required fasting:

1. Blood cholesterol tests: cholesterol is the fatty substance in the blood, high cholesterol can lead to health issues.

Fasting hours: 9 – 12 hours before the test.

2. Gamma-glutamyl transferase test: (GGT) A gamma-glutamyl transferase test, helps to diagnose liver disease. GGT is an enzyme in the liver.

Do not consume alcohol or smoke for 24 hours before the test.

3. Iron blood test: The levels of mineral iron in the blood is measured by an iron blood test

Some people consume iron supplements or multivitamin tablets that contain iron, which can affect the result. If a person regularly takes these supplements, then they should not consume that tablets or supplements for 24 hours before the iron blood test.

Some other blood tests that require fasting:

  • Basic or comprehensive metabolic tests
  • Renal function panel
  • Vitamin B12 test

Avoid alcohol, smoking, coffee, exercise when fasting because these can also affect digestion could lead to inaccurate results.

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