Contrast Allergy
Allergic reactions to contrast agents can occur, although they are uncommon. Reactions can range from mild to severe, so it is important to recognize symptoms and clearly report any allergy history before an exam.
Symptoms that may occur
Mild reactions include itching, skin redness, sneezing, or a warm feeling in the body. Moderate reactions may include spreading hives, nausea, or vomiting. These are usually managed quickly by the medical team.
Severe reactions, though rare, can include shortness of breath, swelling of the face or throat, a drop in blood pressure, or fainting. This is a medical emergency.
Prevention and preparation
Tell your doctor and staff about any history of contrast, drug, or food allergies, and about reactions you have had before. Your doctor may prescribe preventive medication if the history is significant.
Patients with asthma or severe allergies are often considered at higher risk, so special preparation may be arranged.
If a reaction occurs
Tell staff right away. Medical teams in imaging areas are trained to manage contrast reactions and usually stop further contrast administration.
After the exam, record any reaction and share it with your doctor so your allergy history can be updated for future exams.
Key points
- Tell staff immediately if you have shortness of breath or swelling.
- Record your allergy history and current medications.
Educational information, not a substitute for medical advice.