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Yes, you can add chlorophyll to hot tea, but cooler water preserves color and taste better.

No, avoid coffee for the first 24 hours after oral surgery; hot or caffeinated drinks raise bleeding and dry-socket risk.

Yes, for routine urine screens coffee is fine; for 24-hour or catecholamine urine tests, avoid caffeine per lab prep rules.

Yes—plain black coffee is often allowed before a pelvic ultrasound, but water is preferred and your clinic’s prep rules take priority.

Yes—coffee before a COVID-19 dose is generally fine; stay hydrated and avoid pre-dose pain medicines.

Yes, plain coffee is fine before a bone density test; avoid calcium supplements for 24 hours and skip calcium-fortified add-ins near your scan.

Yes, plain coffee and unsweetened tea fit most fasting plans; any calories or creamers break the fast.

Yes, most people can return to coffee in moderation after cardiac surgery once their care team gives the okay.

No—avoid coffee for the first 24 hours after wisdom tooth removal; reintroduce lukewarm or iced coffee slowly once swelling eases.

No, for a fasting lipid blood test only water is advised; coffee, even black, can shift cholesterol testing and triglycerides.