What statement by a patient indicates a contraindication to undergoing a hysterosalpingography (HSG)?

The correct statement indicating a contraindication to undergoing a hysterosalpingography (HSG) is related to the patient's allergy to iodine. HSG is a procedure that typically involves the injection of a contrast dye into the uterus and fallopian tubes to visualize their shape and patency using X-ray. The contrast agent often contains iodine. Therefore, if a patient is allergic to iodine, it presents a significant risk of an allergic reaction during the procedure. Such a reaction can range from mild to severe and could endanger the patient’s safety during the examination.

The other statements do not present immediate contraindications. For example, taking medicine for a vaginal infection may warrant caution, but it does not explicitly disqualify the patient from having HSG. Recent abdominal surgery may raise concerns regarding the patient's recovery or the potential for adhesion-related complications but does not inherently prevent the procedure. Not having a menstrual period that month may affect timing or preparation but is not a contraindication for performing an HSG. Thus, the presence of an iodine allergy is the critical factor that makes the procedure inadvisable.