Why is it important to dip the Bacteruritest into the urine as far as the indicated line?

1). As the area and type of paper are constant, the number of transferred bacteria from the same sample will be same. So, the test is reproducible.

2). the number of bacteria grown on the specific inoculated area can be counted and compared. MAST strip proposed that 20 or more colony count on that area regardless of starains can be considered significant.