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No, a standard echocardiogram usually doesn’t require fasting, but a transesophageal echo or some stress tests often do.

No, you don’t need to fast for a drug urine test; eat as usual unless the testing site says otherwise.

Yes, many labs ask 8–12 hours fasting for a CMP, mainly for glucose, but some CMPs don’t.

No, most creatinine tests don’t need fasting, unless it’s part of a larger blood panel that requires 8–12 hours without food.

Yes, many centers want a 2–4 hour fast before a CT scan with contrast, with water allowed unless your facility says otherwise.

No, many cholesterol tests work without fasting; fasting 8–12 hours is used when triglycerides are high or your clinician requests it.

No, a CBC with differential and platelets usually doesn’t need fasting unless your clinician paired it with fasting labs.

Most celiac blood work doesn’t need fasting, but keep gluten in your diet and follow any lab instructions for your panel.

Chia seeds contain calories, so they end a strict fast, while they can still fit neatly inside your eating window on many fasting schedules.

Drinks with calories end a strict fast, but the fallout depends on your goal and the drink’s mix of sugar, protein, and fat.