Dry tap bone marrow aspiration: clinical significance.

Failure to obtain bone marrow on attempted marrow aspiration, "dry tap," has commonly been ascribed to faulty technique. All reports of simultaneous marrow aspirations and biopsies performed at the University of Virginia between January 1, 1983, and July 1, 1989, were reviewed to determine the frequency of dry taps, the diagnoses and pathologic findings in these cases, and the associated laboratory findings. Among 2,235 simultaneous bone marrow aspirations and biopsies, 87 were dry taps (3.9%). Of these 87 dry taps, only six (6.9%) showed normal marrow biopsies, whereas the majority showed significant marrow pathology, usually associated with fibrosis, or hypercellularity, or both. These conditions most likely account for the inability to aspirate marrow. The most frequent diagnoses were metastatic carcinoma (17.2%), chronic myelogenous leukemia (14.9%), idiopathic myelofibrosis (13.8%), and hairy cell leukemia (10.3%). The presence of peripheral blood nucleated red blood cells, thrombocytopenia, and elevation of the serum lactate dehydrogenase were frequent findings in patients who experienced dry taps. Methods to obtain sufficient marrow for rapid diagnosis in these cases are discussed.