{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T05:44:21Z","timestamp":1792129461417,"version":"4.4.0"},"reference-count":12,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2016,11,7]],"date-time":"2016-11-07T00:00:00Z","timestamp":1478476800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J of Ultrasound Medicine"],"published-print":{"date-parts":[[2016,12]]},"abstract":"<jats:sec><jats:title>Objectives<\/jats:title><jats:p>The purpose of this study was to produce sonographic reference data for maternal renal pelvis dilatation in asymptomatic pregnant women.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A prospective cross\u2010sectional study was undertaken on pregnant women presenting for outpatient obstetric imaging. For each side, the renal length and axial anteroposterior diameter of the renal pelvis were measured. Maternal demographics, gravidity and parity, number of fetuses, and estimated fetal weight (when available) were recorded.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A total of 700 women enrolled, with 191 excluded. The 509 women analyzed included 465 singleton and 44 twin pregnancies. A total of 815 sonographic investigations were performed: 716 in singleton pregnancies and 99 in twin pregnancies. The gestational age range was 10 to 40 weeks. Charts depicting the anteroposterior renal pelvis diameter versus gestational age were constructed to determine normative sonographic reference data for maternal renal pelvis dilatation in singleton pregnancies. Although the mean renal pelvis diameter increased as pregnancy progressed, measurements of greater than 10 mm remained relatively uncommon, being identified in 9.7% of right and 2.1% of left kidneys in the third trimester. Only 4.1% of right and 0.4% of left third\u2010trimester measurements exceeded 15 mm. Right renal pelvis measurements on average were greater than the left by 1.54 mm (95% confidence interval [CI], 1.20 to 1.87 mm). Twins had significantly larger renal pelvis measurements than singletons on average, measuring 2.11 mm (95% CI, 1.50 to 2.72 mm) larger on the right and 1.69 mm (95% CI, 0.73 to 2.65) on the left.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>We present sonographic reference data for asymptomatic pregnancy\u2010related renal pelvis dilatation in singleton pregnancies from a large cohort of women.<\/jats:p><\/jats:sec>","DOI":"10.7863\/ultra.15.12036","type":"journal-article","created":{"date-parts":[[2016,11,8]],"date-time":"2016-11-08T04:08:26Z","timestamp":1478578106000},"page":"2659-2664","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Maternal Physiologic Renal Pelvis Dilatation in Pregnancy"],"prefix":"10.1002","volume":"35","author":[{"given":"Sahan Udayanga","family":"Wadasinghe","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Louisa","family":"Metcalf","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patricia","family":"Metcalf","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David","family":"Perry","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2016,11,7]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/0028-2243(88)90130-X"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.7863\/jum.1983.2.6.255"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1471-0528.2002.01545.x"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1148\/radiology.211.3.r99jn20609"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1148\/radiology.146.1.6849041"},{"key":"e_1_2_7_7_1","first-page":"29","article-title":"Ultrasonographic assessment of hydronephrosis of pregnancy","volume":"34","author":"Anderson IH","year":"1983","journal-title":"J Can Assoc Radiol"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1479-828X.1984.tb03313.x"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0002-9378(98)70552-6"},{"key":"e_1_2_7_10_1","article-title":"National women's annual clinical report 2014","author":"Auckland District Health Board","journal-title":"Auckland District Health Board website"},{"key":"e_1_2_7_11_1","first-page":"482","article-title":"Hydronephrosis during pregnancy","volume":"25","author":"McArthur T","year":"2007","journal-title":"J Emerg Med"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0002-9378(11)91705-0"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.1590\/0100-3984.2013.1822"}],"container-title":["Journal of Ultrasound in Medicine"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.7863%2Fultra.15.12036","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.7863%2Fultra.15.12036","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.7863\/ultra.15.12036","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,10,19]],"date-time":"2023-10-19T05:20:40Z","timestamp":1697692840000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.7863\/ultra.15.12036"}},"subtitle":["Sonographic Reference Data"],"short-title":[],"issued":{"date-parts":[[2016,11,7]]},"references-count":12,"journal-issue":{"issue":"12","published-print":{"date-parts":[[2016,12]]}},"alternative-id":["10.7863\/ultra.15.12036"],"URL":"https:\/\/doi.org\/10.7863\/ultra.15.12036","archive":["Portico"],"relation":{},"ISSN":["0278-4297","1550-9613"],"issn-type":[{"value":"0278-4297","type":"print"},{"value":"1550-9613","type":"electronic"}],"subject":[],"published":{"date-parts":[[2016,11,7]]},"assertion":[{"value":"2015-12-21","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2016-03-02","order":1,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2016-11-07","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}