In most hospital nowadays, immunohistochemical stains is used in the bone marrow analysis. However, the usage of formalin or decalcifying fluid is decreased and it takes too long to(2)). For the removal of these problems, aspirates might be supplemented in the immunohistochemical stains. We studied the assay method using the use of the aspirates and discuss its benefits. In fact, this new method reduces the report time delay due to the long analysis time of the previous method. However, aspirates is very sensitive to the specimen status. It is desirable to use both methods in the bone marrow analysis.