P879: EXENT AND FLC MASS SPECTROMETRY FOR SEROLOGICAL IDENTIFICATION AND QUANTIFICATION OF MONOCLONAL IMMUNOGLOBULINS IN MULTIPLE MYELOMA. (23rd June 2022) - Huhn, S.; Poos, A. M.; Mai, E. K.; Hänel, M.; Salwender, H. J.; Dürig, J.; Blau, I. W.; Scheid, C.; Weisel, K. C.; Munder, M.; Berlanga, O.; Bertsch, U.; et al.