Coffee Consumption Before Ultrasound: No Significant Interference
**Coffee (caffeine) does not meaningfully interfere with ultrasound imaging.** Ultrasound uses sound waves; it is not affected by gastric contents, caffeine, or metabolic state in standard exams.
Exam-Specific Considerations
- Abdominal/Pelvic/Renal/Thyroid/Transvaginal: No restriction. Coffee allowed.
- Fasting Required: Some abdominal ultrasounds (gallbladder, pancreas) require 6–8 hr fast to reduce bowel gas and ensure gallbladder distension. **Black coffee is usually permitted** (clear liquid), but confirm with facility.
- Obstetric: Full bladder often needed (drink water); coffee's diuretic effect may help but water preferred.
- Contrast-Enhanced US: Rare; follow specific prep.
Why the Myth Exists
Confusion with **CT/MRI contrast prep** (fasting for IV contrast), **nuclear medicine** (caffeine blocks adenosine stress test), or **endoscopy** (fasting for sedation).
Best Practice
Follow **your imaging center's written instructions**. If unspecified, moderate coffee is fine.
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