Q: What is upper lip bite test (ULBT)?
Answer: A test to assess difficult video laryngoscopy
ULBT is performed prior to video laryngoscopy to assess its difficulty. It is performed by asking the patient to extend his or her jaw and cover the upper lip with their lower incisors. If the patient can fully cover their upper lip with their lower incisors, video laryngoscopy would likely to be easy.
ULBT is validated via a systematic review of 27 studies comprised of about 18,000 patients. It carries a high specificity and a high negative predictive value. The accuracy of ULBT was more than 85% in 24 out of 27 studies.
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Reference:
Faramarzi E, Soleimanpour H, Khan ZH, et al. Upper lip bite test for prediction of difficult airway: A systematic review. Pak J Med Sci 2018; 34:1019.
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