Could a 1-Hour allergy shot replace the 4-Hour wait for emergency CT?
NCT ID NCT07268248
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study tests whether giving a steroid and antihistamine just 1 hour before a CT scan is as safe as the standard 4-hour premedication for people with contrast allergies. It involves 540 emergency department adults who need a CT for a serious condition. If successful, it could speed up critical imaging without raising the risk of allergic reactions.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
- Active substance
- Methylprednisolone and diphenhydramine (steroid and antihistamine)
- What this could lead to
- If it works, this could shorten the wait time for emergency CT scans in patients with contrast allergies, allowing faster diagnosis and treatment.
- What could go wrong
- This is a small, early-stage trial (540 participants) testing non-inferiority, so it may not prove the shorter regimen is equally safe. Allergic reactions, though rare, could still occur.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
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