There is no surprise that more extensive testing1 and larger numbers of observations1 have been made in the decade since the definition of weak D types4 was published in 1999. Such corroborating data are important, very welcome and enhance our knowledge. Despite abstracts and oral communications claiming allo-anti-D, there has been no publication to date substantiating such claims of allo-anti-D in prevalent weak D types 1, 2, 3 and 4.0. Even if one or more case reports in the future were to prove allo-anti-D unambiguously, the current clinical recommendations for prevalent weak D types might not be affected. Based on the extensive study by Pham et al.,