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Blood tests are used to measure or examine cells, chemicals, proteins, or other substances in the blood. Blood testing, also known as blood work, is one of the most common types of lab tests. Blood work is often included as part of a regular check up. Blood tests are also used to:

• Help diagnose certain diseases and conditions.
• Check how well your organs are working. Your organs include your liver, kidneys, heart, and thyroid.
• Find out if treatment for a disease is working
• Monitor a chronic disease or condition, such as diabetes or high cholesterol.
• Find out if your immune system is having trouble fighting infections
• Help diagnose bleeding or clotting disorders

Preparation for blood test

• avoid eating or drinking anything (fasting) apart from water, for up to 12 hours
• stop taking certain medicines