检查 指南是以足月儿测量值为基础；早产儿的幽门管长度更短。[9]Haider N, Spicer R, Grier D. Ultrasound diagnosis of infantile hypertrophic pyloric stenosis: determinants of pyloric length and the effect of prematurity. Clin Radiol. 2002;57:136-139.http://www.ncbi.nlm.nih.gov/pubmed/11977948?tool=bestpractice.com
[Figure caption and citation for the preceding image starts]: 幽门超声。<1> 间隔：长度；<2> 间隔：肌肉宽度来自 Jeffrey S. Upperman 博士的著作集；获准使用 [Citation ends].
据报告，超声的敏感度为 97%~99%。[5]Stunden RJ, LeQuesne GW, Little K. The improved ultrasound diagnosis of hypertrophic pyloric stenosis. Pediatr Radiol. 1986;16:200-205.http://www.ncbi.nlm.nih.gov/pubmed/3517794?tool=bestpractice.com[8]Neilson D, Hollman AS. The ultrasonic diagnosis of infantile hypertrophic pyloric stenosis: technique and accuracy. Clin Radiol. 1994;49:246-247.http://www.ncbi.nlm.nih.gov/pubmed/8162680?tool=bestpractice.com[41]Hernanz-Schulman M, Sells LL, Ambrosino MM, et al. Hypertrophic pyloric stenosis in the infant without a palpable olive: accuracy of sonographic diagnosis. Radiology. 1994;193:771-776.http://www.ncbi.nlm.nih.gov/pubmed/7972822?tool=bestpractice.com[42]Tunell WP, Wilson DA. Pyloric stenosis: diagnosis by real time sonography, the pyloric muscle length method. J Pediatr Surg. 1984;19:795-799.http://www.ncbi.nlm.nih.gov/pubmed/6394734?tool=bestpractice.com[43]Iqbal CW, Rivard DC, Mortellaro VE, et al. Evaluation of ultrasonographic parameters in the diagnosis of pyloric stenosis relative to patient age and size. J Pediatr Surg. 2012;47:1542-1547.http://www.ncbi.nlm.nih.gov/pubmed/22901914?tool=bestpractice.com
