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Blood Tests

Guys and St Thomas' run a walk-in open access Phlebotomy service in Gracefield Gardens across the waiting room from us.

It is open Monday – Friday 08:45 - 16:45 (adults only)

Please ensure you have your blood form before going to have your test. The wait for the walk-in service can be quite long in busy periods (Mondays 9-11am)

Bloods need to be taken before 16:45 so they can be delivered to the laboratory on the same day, as most blood samples cannot be stored overnight.

After blood tests require you to fast to ensure the results are accurate. If your blood test is a fasting blood test this means that you cannot eat or drink anything apart from water after midnight the night before your test. If you are not sure if your test requires you to fast then please ask at reception and they will check for you.

If your child needs a blood test, please go to:

Evelina Children’s London Hospital
Level 0 (ground floor)
Westminster Bridge Road
London SE1 7EH

Tel: 020 7188 4778
Opening hours: 8.30am-5.45pm
Monday-Friday

About Blood Tests

A blood test is when a sample of blood is taken for testing in a laboratory. Blood tests have a wide range of uses and are one of the most common types of medical test. For example, a blood test can be used to:

  • assess your general state of health
  • confirm the presence of a bacterial or viral infection
  • see how well certain organs, such as the liver and kidneys, are functioning

A blood test usually involves the phlebotomist taking a blood sample from a blood vessel in your arm. and the usual place for a sample is the inside of the elbow or wrist, where the veins are relatively close to the surface. Blood samples from children are most commonly taken from the back of the hand. The child's hand will be anaesthetised (numbed) with a special cream before the sample is taken.

You can find out more about blood tests, their purpose and the way they are performed on the NHS Choices website.



Call 111 when you need medical help fast but it’s not a 999 emergencyNHS ChoicesThis site is brought to you by My Surgery Website