CFR > Title 21 - Food and Drugs > CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES > SUBCHAPTER H—MEDICAL DEVICES (parts 800 to 898) > PART 864—HEMATOLOGY AND PATHOLOGY DEVICES > SUBPART G—Manual Hematology Devices (§864.6100 to §864.6700) > 864.6650—Platelet adhesion test.