- All laboratory and imaging studies must be completed and satisfactory within 30 days of signing the consent document, with the exceptions of: negative serum pregnancy test for women of child-bearing potential which must be negative within 7 days of screening, human leukocyte antigen (HLA) typing which will not be repeated if performed previously, and pulmonary function tests (PFTs)/cardiac stress tests whose results are valid for 6 months if performed previously.