内容简介：
-- Focuses on normal white blood cell morphology-- The Level 1 DIFF is a self-paced learning tool; it provides 100-cell leukocyte differential counts and immediate feedback for each cell ID and a second try for misidentified cells; it keeps a running total of right/wrong answers and compares the actual distribution of cell types with the user's totals; and, after completion, it lets the user review all incorrect answers-- The Level 2 DIFF is more structured; it allows only one chance to ID each cell and no feedback until the end of the diff; its 100 cells are completely different from those in Level 1; cell order is randomized for each user; this diff also includes a password-guarded journal file that records the user's score