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How to Prepare for Your Blood Test: Tips for Accurate Results

PBTT

Private Blood Tests Team

Clinical Team

25 Nov 20244 min read

Proper preparation for your blood test helps ensure accurate results. Here's what you need to know before your appointment at [Private Blood Tests London](/).

Fasting Requirements

Some blood tests require fasting (not eating or drinking anything except water) for a period before your test:

  • Fasting glucose test - 8-12 hours fasting
  • Lipid profile (cholesterol) - 9-12 hours fasting
  • Iron studies - Fasting may be recommended
  • If fasting is required, you can still drink water – in fact, staying hydrated is recommended.

    Tests That Don't Require Fasting

    Many tests do not require fasting, including:

  • Full blood count
  • Thyroid function tests
  • Kidney function tests
  • Most STI tests
  • HbA1c (diabetes marker)
  • General Tips for Your Appointment

    Stay hydrated - Drinking water makes it easier to draw blood and can make the process more comfortable.

    Wear appropriate clothing - Wear a short-sleeved top or one with sleeves that can easily be rolled up.

    Inform us of medications - Let us know about any medications or supplements you are taking, as some can affect test results.

    Relax - If you're nervous about needles, let our team know. Our experienced nurses are skilled at making the process as comfortable as possible.

    What to Expect

    Blood draws at our clinic typically take just a few minutes. Our registered nurse Luciana and the team are experienced in phlebotomy and committed to making your experience as smooth as possible.

    After Your Test

    After your blood test:

  • You can eat and drink normally (unless advised otherwise)
  • Keep the plaster on for a few hours
  • Avoid heavy lifting with the arm used for the blood draw for a few hours
  • Your results will be sent to you securely once processed. We provide raw data only and do not offer interpretation services. Please share your results with your GP or healthcare provider for professional interpretation and any follow-up care.

    Ready to Book Your Test?

    Visit our CQC-registered clinic in South Kensington for professional blood testing services.