15. Pulmonary function test demonstrating a diffusion capacity of least 50% predicted (Myeloablative Regimen 4, Reduced Intensity Regimen 3) or at least 40% predicted (Nonmyeloablative Regimen 2). For children < 7 years of age who are unable to perform pulmonary function test (PFT), oxygen saturation > 92% on room air by pulse oximetry.