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Blood tests (phlebotomy)

Please note that we do not accept GP referrals for blood tests. 

Blood tests are used to diagnose illness and monitor treatment whereas phlebotomy is the actual procedure that removes blood from the body. 

The phlebotomy departments are based in out-patients at Ealing and Northwick Park and St Mark's Hospitals and it is a walk-in service where patients take a ticket and wait their turn. 

Please note that it is not possible to book appointments for blood tests. More information is below on blood tests for both adults and children.

Click on the Contact tab for clinic times.

Patient instructions
Please bring your request form with you. It should contain the following information: full name, date of birth or hospital number and clinical details.

Please tell the phlebotomist if:

  • You do not feel well
  • You take medication that thins your blood (warfarin or aspirin)
  • You are fasting
  • You are having a glucose tolerance test.

When having blood taken, several different tubes of blood may be required, which can be taken from a single skin puncture. 

  • After the blood has been taken, the puncture will be covered by a dressing. Apply pressure to reduce the risk of bleeding and keep the dressing for at least 30 minutes
  • Avoid heavy lifting with that arm for several hours prior to blood being taken.

A small bruise may occur after your test due to blood leaking from the punctured vein and collecting under the skin. This is normal and will disappear in a few days.

Results from your blood tests will be sent directly to your doctor.

Blood tests for children 
Depending on the age of the child needing the blood test, the procedure may take place in a different location. 

For Central Middlesex, Northwick Park and St Mark's Hospitals, blood samples will be collected from children:

  • Below 10 years old in paediatric daycare
  • Ten years and above in phlebotomy.

For Ealing Hospital, blood samples will be collected from children:

  • Below two years old in paediatric daycare
  • Two - five years old in the community
  • Above five years in phlebotomy.

Specific test information

Fasting blood tests
Certain tests may require you to decrease the amount you eat before the test.  For example, tests for lipids or glucose may require fasting for 12 or more hours. 

  • Please arrive as early as possible in the morning
  • Please do not eat or drink anything except for water for 12 hours before blood collection
  • Please seek advice from your doctor regarding any medication you are currently taking.

Oral Glucose Tolerance Test (GTT)
Please ensure that you have fasted for at least 12 hours before this test.

A blood sample will be taken when you arrive and then you will be asked to drink a glucose drink.

After the drink you need to wait for two hours before we take a second blood sample. It is important that you do not eat or drink or take any form of exercise during this time.

Central Middlesex, Northwick Park and St Mark's Hospitals
The clinic is located on Level 4 at Northwick Park Hospital, to the right of the main reception. Opening times are Monday to Friday from 8am to 5pm (excluding public holidays). The last ticket is issued at 4.30pm.  

For GP patients, arrangements for blood samples should be made at your local GP practice.  Phlebotomy for GP patients is not available on site.

Arrangements for oral glucose tolerance tests may be made in person at Phlebotomy.

Tel. 020 8869 3111 (for general enquiries)

Ealing Hospital
The clinic is located on Level 2 (Out-patient Clinic 1). Opening times are Monday to Friday from 8am to 4.30pm (excluding public holidays). Map and directions

Children, patients from the community as well as referrals from GPs are asked to arrive before 4pm for blood tests.   Please note last ticket will be issued at 3.45pm for patients referred by their GP.

Please note that appointments cannot be made, except in the case of specialist tests (e.g. oral glucose tolerance test, chromosome analysis, gastrin), which should be made in person.

Tel. 020 8967 5399

Ealing Hospital

Sophie Gohil, Phlebotomy Manager

Northwick Park and St Mark's Hospital

Doracia Ollivierre, Lead Nurse