Food Intolerance test – at central London Clinic £280.00 Our food intolerance test is a professional blood test and covers 190 foods. The test is carried out at our clinic in central London (nearest tube Great Portland Street or Oxford Circus) so that our nurse can take a blood sample. The cost of this test is £280. This test is by appointment only with our nurse. Our clinic is open 9.30-5pm Monday to Thursday and from 9.30-2 pm on Friday. The results will take approximately 2-3 weeks. Add to basket