Antibody titers are actually semi-quantitative, and if they are fully quantitative, the corresponding value, which is the result of the corresponding antibody, will be expressed as a number followed by the corresponding unit. However, if the quantification is not complete, but is expressed as a titer, the corresponding result will not be an exact number or followed by a decimal point. Instead, it will be presented as a ratio of 1:1, 1:2, 1:4, 1:8, etc., in multiples of 2. This is similar to quantitation, except that the quantitative range is not very clear, for example, if 1:8 is positive, then 1:1, 1:2, 1:4 will be positive, while 1:16 can be negative, and the corresponding antibody titer is determined in this way. The ability to distribute the corresponding quantitative values in a range, for example, 1:8 positive and 1:16 negative, which is actually between 1:8 and 1:16, is what is meant by antibody titer.