“…One of the least frequent causes of positive pretrans fusion tests is the presence in the patient's serum of anti bodies against chloramphenicol [5], neomycin [6], tetra cycline [3], hydrocortisone [7], which are often used as preservatives in the preparation of reagent RBCs. It may also be produced by alloantibodies or autoantibodies whose detection requires the presence of drugs, such as caprylate (autoanti-e) [8], borate (anti-A) [9],chloram phenicol (anti-Ai) [10], paraben (autoanti-Jk"') [11], thimerosal (IgG autoantibody) [12], sodium azide (anti-I) [13], LISS (anti-Pr,) [14], Drug-dependent antibodies without apparent group specificity have also been described [15], and some antidrug antibodies may adhere to the RBC surface by means of the Matuhasi-Ogata phenomenon yes ves ves yes yes ves…”