Eight traps, one move: identify the immune arm first, then use the lab clue that separates the look-alikes.
A 10-month-old boy has recurrent otitis media, eczema, and petechiae. Labs show platelets 40,000 with low MPV, low IgM, and elevated IgA/IgE.
What's the diagnosis?
Read the infection pattern, pick the immune arm that failed, then use the feedback to lock the mechanism. This is the step that separates every disease on the page.
Each finding belongs to one broken immune branch. Make the branch call before the disease name.
Board stems give you a kid with infections. You need to work through the labs to find the deficiency. This is the algorithm.
clinical vignettes. Four options, one correct. The explanation matters more than the answer.
Every reload picks 6 from a pool of 14 and shuffles the answer order. No memorizing the pattern.
Tap any image to enlarge. These are the findings you need to recognize in clinical practice.
