[One case report of anti-JK1 antibody undetected on plasma sample]. / A propos d'un cas d'allo-immunisation anti-JK1 non dépisté sur plasma.

The sensitivity of the detection of irregular antibodies (DIA) is one of the fundamental bases of transfusion safety. Its implementation is specified in accordance with a very specific framework that allows the use of serum or plasma. The case reported here points out a failure to detect irregular antibodies in plasma sample. Thus a low intensity anti-JK1 antibody detected and identified in serum slipped through unnoticed in plasma. The difficulties to detect and identify this antibody, well-known as a deceptive and dangerous one, are being discussed in order to better assess the limitations of DIA.