Final answer:
The normal range of relative lymphocyte count for a 1-year-old is generally higher than that of adults and typically falls within 20-30% of the total WBC count. However, specific age-adjusted ranges must be considered for precise numbers, which are not provided in the options. A more complete differential WBC count is needed to determine the correct lymphocyte count for a 1-year-old.
Step-by-step explanation:
The normal range of relative lymphocyte count in a 1-year-old should be considered alongside the total white blood cell (WBC) count. Lymphocytes typically account for about 20-30% of all leukocytes in the blood. When taking into account the total number of WBCs, which is generally considered healthy within the range of 3.5 to 11 x 10⁹ cells/L, a relative lymphocyte count would proportionally fall in line with the total count.
However, this question seems to ask for the normal relative lymphocyte count specifically for a 1-year-old without providing the total WBC count. Given the age-specific nature of lymphocyte percentages, the normal range for infants and young children tends to be higher than in adults. Though specific age-adjusted reference ranges aren't provided here, it is often recognized that the relative lymphocyte count for younger children (such as those from ages 0 to 2.5 years) can be quite high.
Without precise age-specific reference ranges, we cannot definitively select one of the provided options as the correct relative lymphocyte count for a 1-year-old. Typically, adults have lymphocyte counts around 1,000 per microliter (which parallels with the 20-30% of the total leukocyte count), but these values are higher for children. Inference from the data suggest that none of the numbers provided as options (1.1, 2.27, 3.35-50, 4.50) falls within an expected relative lymphocyte percentage for a 1-year-old.