Factors that cause abnormal levels of urobilinogen in urine. The urobilinogen amount in urine could deviate from the normal range; it could be found to be lower or higher. Regardless, any value that does not conform to the standard range is indicative of a health problem. 1  Low levels of Urobilinogen.
Use in Major League Baseball . The concept of the Designated Hitter was proposed in the early 1900s and came fairly close to being initiated in the 1920s. It was finally approved in the 1970s. The Designated Hitter is used only in the American League (since 1973) and was never adopted in the National League. The rule allowing a DH has always been controversial since some want the rule eliminated, some want the rule adopted in both leagues and some want the rule to remain in its current state.
The modern era is usually considered to have begun in 1901, when the American League became the second major league (there had been other major leagues before then, notably the American Association, but they had all died off by the end of the nineteenth century).