They are usually found to be thrombocytopenic not because of bleeding, but for other reasons, such as a physical examination, or a routine blood test in another department, with varying degrees of thrombocytopenia, ranging from a few to several tens of platelets. The most striking point about the patient is the absence of bleeding manifestations and the absence of obvious triggers that can cause thrombocytopenia. At this time, both the patient and the physician should be alert and the safest approach is: redraw the blood for routine blood tests and anticoagulate with heparin! It is best to make a blood smear for observation at the same time. If there are a lot of platelets, the machine will report a roughly normal value, and at the same time, a lot of platelets are visible on the blood smear microscope. This condition is usually caused by the anticoagulant EDTA in the tubes used for blood collection. When medical personnel are not sufficiently aware of this, it leads to unnecessary further cause finding and often prompts the clinician to find the problem because of the bone marrow finding of quite a few platelets. In fact, heparin can also cause pseudo-thrombocytopenia, as is often encountered in renal failure for hemodialysis. However, the possibility of both anticoagulants occurring in the same patient is rare, and there are also blood smears that can visually confirm the approximate number of platelets.