Hemagglutination Inhibition Assay:[23] A serologic assay which can be used either to screen for antibodies using RBCs with known surface antigens, or to identify RBCs surface antigens such as viruses or bacteria using a panel of known antibodies. This method, performed first by George K. Hirst in 1942, consists of mixing virus samples with serum dilutions so that antibodies bind to the virus before RBCs are added to the mix. Consequently, those viruses bound to antibodies are unable to link RBCs, meaning that a test's positive result due to hemagglutination has been inhibited. On the contrary, if hemagglutination occurs, the test will result negative.A schematic diagram of the experimental setup to detect hemagglutination for blood typing.
Hemagglutination blood typing detection:[24] This method consists of measuring the blood's reflectance spectrum alone (non-agglutination), and that of blood mixed with antibody reagents (agglutination) using a waveguide-mode sensor. As a result, some differences in reflectance between the samples are observed. Once antibodies are added, blood types and Rh(D) typing can be determined using the waveguide-mode sensor. This technique is able to detect weak agglutinations that are almost impossible to detect with the human eye.
ABOblood group determination: Using anti-A and anti-B antibodies that bind specifically to either the A or to the B blood group surface antigens on RBCs, it is possible to test a small sample of blood and determine the ABO blood type of an individual. It does not identify the Rh(D) antigen (Rh blood type).
The bedside card method of blood grouping relies on visual agglutination to determine an individual's blood group. The card contains dried blood group antibody reagents fixed onto its surface. A drop of the individual's blood is placed on each blood group area on the card. The presence or absence of flocculation (visual agglutination) enables a quick and convenient method of determining the ABO and Rhesus status of the individual. As this technique depends on human eyes, it is less reliable than the blood typing based on waveguide-mode sensors.
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