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No, infectious disease blood work usually doesn’t require fasting, unless your order bundles tests that track glucose, fats, or chemistry markers.

Many labs prefer an 8–12 hour fast for an iron panel, yet some don’t require it, so follow the prep note tied to your order.

No, most cortisol blood tests don’t require fasting, but some orders ask for an empty stomach or a timed draw, so follow your lab sheet.

No, most iodine blood tests do not need fasting, unless your clinician adds other labs that call for an empty stomach.

No, most thyroid blood tests don’t need fasting; you’ll only fast if your order includes tests that require an empty stomach.

Yes, fasting is needed for wisdom tooth extraction with IV sedation or general anesthesia; with local anesthetic only, a light meal is often fine.

No, you usually don’t need to fast for a pregnancy blood test (hCG), unless the lab is also drawing fasting labs.

No, a CRP blood test rarely needs fasting; eat normally unless your order includes other blood work that needs an empty stomach.

Most people don’t need to fast for a B12 blood test, but you may be asked to fast when your order includes other fasting labs.

Yes, fasting before a C-section lowers anesthesia risk; your team sets cutoffs for food, clear liquids, and meds.