A two-dimensional titer determination for the optimum dilution of GH label and the antiserum was carried
out. Antibody dilutions ranging from 1:5000 to 1:640,000 and the biotinyl-GH dilutions of 1:500 to 1:16,000 were
tested. The antibody titer of 1:40,000 and the biotinyl-GH conjugate titer of 1:3000 were found to be the most
suitable and achieved an OD450 of around 1.1.