Medical calculators

Maintenance IVF

4-2-1 Rule

For education. Check every result.

Anatium is a study resource, not medical advice. Nothing here is a diagnosis, a prescription or a substitute for a clinician who has seen the patient. Check every number against a current local protocol before it touches anyone, and never act on a result you cannot reproduce yourself.

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How it is calculated

4-2-1 Rule: 4mL/kg for first 10kg, 2mL/kg for next 10kg, 1mL/kg thereafter.

About

Routine daily fluid requirement by weight, for a patient who is not depleted or actively losing.

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