When asked by an older adult client, "What is the difference between my normal laboratory values and the ones for a 55-year-old? The nurse response is based on what understanding?

A. Age-adjusted ranges for older adults for all of the common laboratory findings, similar to those for infants and children: While infants and children have age-adjusted ranges, older adults do not have widely accepted, standardized age-based reference ranges due to high variability in aging. B. Age-adjusted ranges only for the over 85 age-group; there are no expected changes in the 65- to 84-year-old age-group: There is no formal division like this. Physiologic changes related to aging can affect lab values throughout older adulthood, but reference ranges are not stratified this way. C. Age-adjusted ranges only for the hematological tests, which are due mostly to changes in the bone marrow: Some hematologic values may shift, but no standardized, age-adjusted ranges are widely applied across hematologic testing alone. D. No age-adjusted ranges for older adults due to the large variations within the age-group and the increasing number of factors that influence the results: Older adults vary greatly in health status, medications, and chronic conditions, making it difficult to establish standard lab ranges for this group.