OpiCalc

Favorites Specialties Drugs Guidelines Most Used

All Specialties

Favorites Specialties Drugs Guidelines Most Used

Faves Specs Drugs Guides Top

ARISCAT (Pulmonary Risk)ASA Physical Status Aldrete Score (Recovery)Apfel Score (PONV Risk)Bromage Scale Child-Pugh Score (Liver)Cormack-Lehane Grading Gupta MICA (Cardiac Risk)Mallampati Classification NPO Fasting Guidelines STOP-BANG (Sleep Apnea)

OpiCalc

Easy, fast, and private medical tools for clinicians. Always free.

No Login Required

Ready for the Bedside

Resources

About Us Editorial Policy Medical Disclaimer Privacy Policy Terms of Use Cookie Policy

Support

Clinical Notice:OpiCalc is not a substitute for professional clinical judgment. Always verify dosages and guidelines.

OpiCalc © 2018-2026

•

All Rights Reserved

Recent Journal Updates

Intensive Care MedicineJun 8, 2026

International evidence-based recommendations for point-of-care lung ultrasound

Clinical Context

We think this might be relevant to the clinical guidance for NPO Fasting Guidelines.

DiabetologiaJun 6, 2026

Time-restricted eating versus dietetic guidance on glycaemic outcomes in adults at risk of type 2 diabetes: a non-inferiority randomised clinical trial

Clinical Context

We think this might be relevant to the clinical guidance for NPO Fasting Guidelines.

DiabetologiaMay 22, 2026

Age-related patterns of cardiometabolic risk factors for complications in type 2 diabetes

Clinical Context

We think this might be relevant to the clinical guidance for NPO Fasting Guidelines.

NPO Fasting Guidelines

NPO Fasting Guidelines: Pre-operative fasting recommendations per ASA standards to reduce aspiration risk.

Select Intake Type

Recommended NPO Duration

2 hours

Examples: Water, black coffee (no cream), tea, clear broth, sports drinks, apple juice

Important Considerations:

Start fasting from midnight for morning surgeries
Follow your specific surgeon/anesthesiologist instructions
Some medications with sips of water may be permitted
Pregnant patients: 8 hrs solid, 2 hrs clear liquids
Confirm NPO status before procedures

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Last Comprehensive Review: 2026

Related Anesthesiology Tools

ASA Physical Status

Cormack-Lehane Grading

Child-Pugh Score

Mallampati Classification

Anesthesiology Calculators Internal Medicine Calculators Emergency Medicine Calculators

Have feedback about this calculator?Let us know.