I would review some of these references with your pathologist. It's definitely not an exhaustive list.
Judd, W. J., Butch, S. H., Oberman, H. A., Steiner, E. A. and Bauer, R. C. (1980), The Evaluation of a Positive Direct Antiglobulin Test in Pretransfusion Testing. Transfusion, 20: 17–23. doi: 10.1046/j.1537-2995.1980.20180125036.x
Judd, W. J., Barnes, B. A., Steiner, E. A., Oberman, H. A., Averill, D. B. and Butch, S. H. (1986), The evaluation of a positive direct antiglobulin test (autocontrol) in pretransfusion testing revisited. Transfusion, 26: 220–224. doi: 10.1046/j.1537-2995.1986.26386209372.x
Stec, N., Shirey, R. S., Smith, B., Kickler, T. S. and Ness, P. M. (1986), The efficacy of performing red cell elution studies in the pretransfusion testing of patients with positive direct antiglobulin tests. Transfusion, 26: 225–226. doi: 10.1046/j.1537-2995.1986.26386209373.x
Domen R.E. and Grattan J. (1986). Efficacy of performing red-cell antibody elutions in patients with a positive direct antiglobulin test, Vox Sang, 51:324-326.
Johnson, M.F.M. and Belota, M.K. (1988). Determination of need for elution studies for positive direct antiglobulin tests in pretransfusion testing, Am J Clin Pathol, 90(1):58-62. doi: 10.1093/ajcp/90.1.58
Perkins, J.T., Arruza, M., Fong, K., Sosler, S.D., and Saporito, C. (1990). The relative utility of the autologous control and the antiglobulin test phase of the crossmatch, Transfusion, 30: 503-507. doi: 10.1046/j.1537-2995.1990.30690333479.x
Richa, E., Benidt, G., Tauscher, C., Stowers, R., Bryant, S., and Stubbs, J. (2007). Eluate testing following microscopically positive direct antiglobulin tests with anti-IgG, Ann Clin Lab Sci, 37(2):167-169.
Yazer, M. H. and Triulzi, D. J. (2009), The role of the elution in antibody investigations. Transfusion, 49: 2395–2399. doi: 10.1111/j.1537-2995.2009.02304.x