The short version
- Ask the site for the exact hours they want.
- Water rules vary; do not invent them from a blog.
- Medicines stay a clinician conversation.
What fasting usually means
Many protocols ask for no food for a set number of hours before a morning draw. Some allow water; some do not. The protocol and the site staff own the exact rule.
Why research asks
Some chemistry panels and metabolic measurements shift after a meal. Keeping the window consistent across volunteers makes results comparable.
Practical questions for the site
- How many hours without food?
- Is water allowed?
- What about morning medicines?
- What if I ate by mistake?
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