A test element for agglutination tests, comprising a receiving and mixing region for a sample and reagents and a reaction capillary having an upstream region which produces a capillary effect causing the sample-reagents mixture to flow at a speed which is greater than along a downstream region of the...http://www.google.co.uk/patents/US5019351?utm_source=gb-gplus-sharePatent US5019351 - Agglutination reaction slide
