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No, you usually shouldn’t drink coffee before a CT scan unless your scan type and written prep sheet clearly allow small amounts of plain black coffee.

Yes, you can usually drink black coffee before a colonoscopy until your clinic’s clear-liquid cut-off, as long as you skip milk and cream.

Yes, you can drink coffee before Botox, but many clinics suggest limiting caffeine for a day to lower bruising, swelling, and jittery side effects.

No, avoid coffee before fasting blood work, since caffeine and additives can alter many test results; drink plain water unless told otherwise.

No, drinking coffee before a fasting blood test can change sugar and fat levels, so stick to plain water unless your clinic tells you otherwise.

Yes, you can drink a small coffee before blood donation, but keep it modest and pair it with extra water to avoid dehydration.

Yes, coffee before an MRI is fine for many routine scans, but some heart or brain exams require no caffeine, so follow your clinic’s instructions.

Yes, you can drink coffee before a mammogram, though cutting back on caffeine for a day or more may make the exam more comfortable.

No, coffee before a fasting blood test can change sugar and fat levels, so most labs only allow plain water during the fasting period.

Yes, you can drink coffee before a standard drug test, but keep your usual amount so your urine does not look suspiciously diluted.