Abstract: A three panel format and method useful to (a) office, (b) clinical research and (c) statistical personnel in connection with the preparation, identification and statistical evaluation of controlled, blinded code designated samples are provided. The format comprises a write-on panel (A) for mounting code designations, and test substance identities arranged so that the code designations will be transferred through panel (A), and a second, removable panel (B) having rows of writing transference substance thereon to a third panel (C), without transferring the test substance to said panel (C), when panel (A) is folded into an in-line writing relationship with said panels (B) and (C). Thereafter, panels (A) and (C) are folded 360.degree. and sealed in an in-line relationship for use thereafter by clinical and statistical personnel.