Impact of Homozygous C4A Deficiency on Clinical Presentation of Systemic Lupus Erythematosus.

Objective: To investigate the association of C4A null allele (C4AQ0) with systemic lupus erythematosus (SLE) and determine the clinical presentation of SLE in relation to C4A null allele.

Study Design: Descriptive study.

Place And Duration Of Study: Armed Forces Institute of Pathology (AFIP), Rawalpindi, Immunology Department, from December 2018 to December 2019.