A Lamb wave scanning system that measures the elastic properties of a material was used to characterize fatigue damage in composites. The Lamb Wave Imager™ (LWI) uses a pulse/receive technique that excites a flexural Lamb mode and measure the time-of-flight over a wide frequency range. Given the material density and plate thickness, the bending and out-of-plane shear stiffnesses are calculated from a reconstruction of the dispersion curve. In this study, the bending stiffness, D11, and out-of-plane stiffness, A55, were obtained for composite samples which have undergone fatigue damage. The stiffness values were compared to crack density measurements as well as the in-plane stiffness, A11, which was obtained from velocity measurements of the extensional Lamb mode. The out-of-plane stiffness measurements correlated well with crack density data and showed a similar trend as measurements of the in-plane stiffness.