The RH View box was originally used for the slide test method. The Slide test method is only used today for RH typing the D antigen. The RH view box is still widely used for test tube agglutination grading at various blood banks and reference labs. Their are advantages and disadvantages to the agglutination viewer when comparing to the RH view box. The most obvious advantage is one can observe slides on the RH View Box and the view box is at 37 centigrade. Another advantage of the RH view box is the flat surface blood bank technologist may use to lay gel cards or solid phase strips on for observation. Some technologist prefer the RH View Box over the Agglutination viewer so that they may tap the tubes against the flat surface when viewing in order to dislodge the cell button as well. This method is not proper procedure but saves time when performing multiple blood groupings. Both Agglutination viewer and RH View Box do not require periodic maintenance unless disassembled.
Test Tube Agglutination Viewers are the primary source used in labs today. Agglutination Viewers are smaller which is an advantage when one considers all the other equipment that goes on the desk in a blood bank. The biggest difference between the RH View Box and and the Agglutination Viewer is the mirror and light source. The light source on the Agglutination Viewer shines down on the test tube then bounces up from the mirror underneath. The mirror may be adjusted to any angle that the technologist is comfortable viewing. Some technologist prefer the mirror to observe the top and bottom of the test tube at the same time when grading. Other technologist prefer to use the mirror without the light source as well. Technologist have stated that it is easier to see the halo’s that are on bottom of test tube or the white that occurs when one has a sample with an mixed field using the concave mirror. Other blood bankers dislike the concave mirror when using the light source in conjunction.