Transient Production of Anti‐LW by LW‐positive People

Abstract

As the result of pregnancy immunization two Rh‐negative women produced anti‐D and anti‐LW, while an Rh‐positive woman produced anti‐LW in response to transfusion. The first two were both initially LW‐negative and direct antiglobulin test negative. One then became direct antiglobulin test positive, and this lasted as long as anti‐LW was present in her plasma. Other observations suggest this may not be a rare occurrence.