I am working on a procedure for identifying IgG and IgM directly on plts. It seems fairly straight forward, but I'm having problems correlating with a national reference lab's results. Are there time sensitive parts of this tests that may be effecting shared samples, or obvious pitfalls in a plt procedure that I'm overlooking? I'd appreciate any input. Dee Dee Logsdon Sacred Heart Medical Center Spokane, WA LogsdoD@shmc.org