In order to assess the incidence and analyze reasons which cause prolongation of hospital stay in patients engrafted after peripheral blood stem cell transplantation (PBSCT), we performed this retrospective analysis. One hundred patients (receiving 123 conditioning regimens) were included in the analysis. Criteria for discharge were presence of myeloid engraftment and absence of severe concomitant problems. Ninety subjects (73%) were discharged just after engraftment was reached on day +12 (10-14). Discharge was delayed in 33 patients (27%) and the mean prolongation was 3 days (1-11). In 31 patients (25%) delayed discharge was due to complications: in 14 patients (11.4%) because of GIT problems, in 16 patients (13%) because of infectious complications and in one patient because of cardiotoxicity. A significantly higher number of infectious complications was found in patients conditioned with BEAM (19.7% vs 4.2%, P < 0.05) while GIT toxicity was the most common reason for discharge delays in patients conditioned with melfalan 200 mg/m2 (8.2% vs 14.7%, NS). No risk factors of hospital stay prolongation were determined. We conclude that in spite of rapid engraftment, non-hematological toxicities and infections remain important limitations for further reduction of the length of patient hospitalization in a significant number of patients after PBSCT.