I've also noticed some errors in the "Step-Up" book as well, like some reversed <,> signs for lab values and another in edocrine using alpha hydroxy instead of Beta 21 deficiency. So, they must be more that I haven's seen yet. Also, how does one check the spotted errors in FA, is there a web site where they might be pointed out?
To the OP, yes, the First Aid is systems based as of 2006 except they have a brief review of biochem and some others in the first part of the book.