<prompt> An absolute contraindication for IVP is -Allergy to the drugMultiple myelomaBlood urea 200 mgRenal tumor  <response>: Although IVU gives excellent images of the urinary tract, its use should be restricted because in a few patients the iodine in the contrast medium may provoke a potentially life-threatening anaphylactic reaction. Patients with a history of allergy, atopy and eczema are particularly vulnerable, but severe reactions may occur without warning. 