PBL groups are becoming common place at most med schools. As a first year student, I know I was not alone in feeling completely lost when it came to interpreting lab values during these sessions. This information simply was not taught to us, so we would be forced to Google lab tests to figure out what they were really telling us. A lot of time would be wasted and often the searches led to useless results. Clinician's Guide to Laboratory Medicine: Pocket is an excellent, time-saving and more accurate alternative to this approach. It explains the basics of each laboratory test, the causes of abnormal values (i.e., the differential diagnoses one should consider), and the approach one should take following an abnormal result. It also provides several algorithms in the form of decision trees for assessing abnormal results. I can see this being an extremely useful resource in the years ahead during clerkship rotations and will be recommending this book to classmates.
In regards to other reviews that mentioned the font size, yes it is small but it should be a non-issue for the majority of med students with normal or myopic vision. If you're having trouble reading the text in this book, maybe it's time to invest in a good pair of reading glasses.