The 3-3-2 rule and upper lip bite test in predicting difficult laryngoscopic intubation

Status

Recruiting

Phases

Early Phase 1

Study type

Observational

Source

TCTR

Registry ID

TCTR20160607002

Enrollment

323

Registered

2016-06-07

Start date

2016-06-15

Completion date

Unknown

Last updated

2026-03-30

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

General anesthesia no history of difficult airway no airway pathology GA difficult airway predicted assessment

Interventions

3&#45

2 rule assessment,ULBT assessment

Diagnostic,Diagnostic

2 rule,ULBT

Eligibility

Sex/Gender

All

Age

18 Years to 65 Years

Inclusion criteria

Inclusion criteria: Age 18-65 yr. ASA classification 1-3 The patient who have elective surgery by general anesthesia with OET.

Exclusion criteria

Exclusion criteria: Age 65 years Aspiration risk Predicted or history of previous difficult intubation BMI > 35 kg/m2 Edentulous Unwillingness to participate in this study.

Design outcomes

Primary

Measure	Time frame
sensitivity and specificity after complete gathering data percentage	—

Secondary

Measure	Time frame
success rate after intubation percentage	—

Countries

Thailand

Contacts

Public ContactRaviwan Akarapatima

Prince of Songkhla University

u5101169@gmail.com66816962949

Outcome results

None listed

Source: TCTR (via WHO ICTRP) · Data processed: Apr 4, 2026

The 3&#45;3&#45;2 rule and upper lip bite test in predicting difficult laryngoscopic intubation