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.
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.