A22-year-old female who adheres to a vegan diet has been diagnosed with iron deficiency anemia. which of the following components of her diagnostic blood work would be most likely to necessitate further investigation?

Karen is waiting by the lockers before school for her friend richard. they had agreed to look over the history review sheet together to be ready for the test later that day. richard shows up late with uncombed hair and wrinkled clothes. karen: "you're five minutes late and you look like a wreck! " richard: (slams his locker) "you know, i don't have time for this." karen: "fine! figure out the test on your own! "