‘I have a blood test coming up — how should I prepare?’: Ask a doctor

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Blood tests are a common recommendation from doctors following a medical appointment or routine check-up. These tests can identify deficiencies in vitamins or minerals, immune system problems, signs of infection, and the functionality of organs like the liver, heart, or kidneys. Screening, diagnostics, and monitoring are the three main reasons why doctors may order blood tests.

Screenings are typically based on age, risk factors, or previous check-ups and can include tests for cholesterol, glucose, HIV, or hepatitis C. Diagnostic tests are ordered based on symptoms reported by the patient to help rule in or rule out diseases. Monitoring tests are performed to track the progress of a diagnosis and ensure treatments are effective.

Before a blood draw, a technician will confirm your identity, clean the area, and insert a needle to collect blood samples. If you have any fears or anxieties about blood work, it’s essential to discuss them with your healthcare provider. Some people find it helpful to schedule their tests in the morning to minimize fasting time impact.

If fasting is required, you should avoid eating or drinking anything except water for eight to 12 hours before your appointment. Drinking plenty of water beforehand can help prepare your veins for an easier blood draw. Dress in a way that allows easy access to your arm and bring snacks, water, or coffee if you are fasting.

Feeling prepared and having a plan in place can help alleviate anxiety about blood tests. Bringing a friend or relative along for support or listening to music during the procedure can help distract you from the needle. Remember, having a blood test is a quick process and generally isn’t painful.

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