Contrast Allergy Discrepancy Before an Urgent CT
You are a radiographer in the CT department of a MOH hospital in Kuwait. The next patient is a 45-year-old woman booked for a contrast-enhanced CT abdomen/pelvis for suspected ovarian mass. The requisition states 'allergy: none' and is signed by the referring registrar. As you verify identity and consent, she says, 'Last time I had that dye, I broke out in hives and my lips swelled.' She cannot remember where or when, but thinks it was 2 years ago at a private hospital. The scanner is fully booked with 14 patients; the next slot for a non-contrast study is in 6 hours. The referring registrar is not answering his pager, and the on-call radiology consultant is in a procedure. The woman is anxious and says, 'Just do it; I need the answer today.'
1. What immediate actions should you take before any contrast is given?
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- Do not give contrast yet. Hives plus lip swelling suggests a moderate hypersensitivity reaction, not a mild one, and the requisition's 'allergy: none' is inconsistent with the history. Patient safety takes priority over the schedule.
- Verify the history in detail: previous contrast type, timing, treatment needed, any breathing difficulty or hypotension, and whether it was iodinated CT contrast. Check the hospital record and any allergy alert in the electronic system.
- Inform the CT supervisor and contact the on-call radiology consultant or another radiologist. A premedication protocol, if used, requires a physician's order and a planned delay; it cannot be started by the radiographer independently.
- Explain to the patient that her previous reaction matters and that proceeding without a plan could cause a serious reaction. Do not accept her request to 'just do it' as sufficient consent for an avoidable risk.
2. How would you prioritise the list and communicate the delay?
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- The patient's scan is urgent but not immediately life-threatening in the same way as a suspected aortic dissection or major trauma. I would keep her safe and move other patients who are ready for contrast or non-contrast studies while the radiology consultant is contacted.
- If a non-contrast CT could answer the clinical question, discuss with the radiologist; otherwise, a contrast study may need to be rescheduled with premedication or an alternative imaging pathway. The decision must be made by the responsible clinician, not by list pressure.
- Tell the patient clearly what is happening and why: 'We need to check your allergy record and speak to the radiologist before giving dye.' Give her a realistic timeframe and keep her informed.
- Inform the referring team and the CT supervisor about the delay and the reason. Document the allergy discrepancy and the escalation in the patient's record and on the request.
3. What documentation and incident-reporting steps are required?
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- Record the patient's reported reaction in her own words, the date and time, and the fact that the requisition said 'allergy: none'. Enter an allergy alert in the hospital information system and place a visible alert on the request and patient record.
- Document who was notified (supervisor, consultant, referring registrar), what advice was given, and the final decision about contrast and scheduling. Record the patient's anxiety and the explanation given.
- If the incorrect allergy field created a risk of harm, file a patient-safety incident report through the hospital system. The aim is system learning: why the allergy history was not captured before the request was signed.
- Do not alter the original requisition. If a correction is needed, add a dated, signed addendum so the record remains transparent and legally defensible.