[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-618883-105":59,"doc-detail-618883-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","ultrasonic-fetal-measurement-standards-for-an-australian-population-compiled-by-dr-susan-campbell-westerway","Ultrasonic Fetal Measurement Standards for an Australian Population - Compiled by Dr Susan Campbell Westerway","","Ultrasonic fetal measurement standards for an Australian population compiled by Dr Susan Campbell Westerway present regression equations and grouped standard-deviation variability by gestational age. The approach adapts prior AC variability methods by averaging SD changes across gestational week groups rather than using a separate SD each week. Cross-sectional data are based on 11,600 measurements from 3,800 women across 70 nationalities, expressed for parameters including BPD, OFD, head circumference, abdominal circumference, femur, humerus, and related regression and SD models.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/ultrasonic-fetal-measurement-standards-for-an-australian-population-compiled-by-dr-susan-campbell-westerway/618883/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/ultrasonic-fetal-measurement-standards-for-an-australian-population-compiled-by-dr-susan-campbell-westerway/618883.png","ImageObject",300,407,{"name":92,"@type":93},"Lucas Martin","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-09","2026-10-20",true,{"@type":102,"interactionType":103,"userInteractionCount":81},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"How are the standard deviations for head and abdominal circumferences handled in these standards?","Question",{"text":112,"@type":113},"The method groups gestational weeks and averages the variations of standard deviations, instead of varying SD at each individual week.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What data set underpins the fetal measurement standards?",{"text":117,"@type":113},"The cross-sectional study uses 11,600 measurements collected from 3,800 women representing 70 nationalities, based on completed weeks of gestation.",{"name":119,"@type":110,"acceptedAnswer":120},"Which fetal measurements are modeled using regression analysis in the document?",{"text":121,"@type":113},"Regression equations are provided for crown-rump length (CRL) and for measurements including BPD, OFD, head circumference (HC), abdominal circumference (AC), femur length (FL), and humerus length (HL).","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},618883,1792667173,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":81,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":39,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":46,"preview_page_count":4},8796095360427,"https://ap-avatar.wpscdn.com/davatar_994ba38a5ba835b3df7d355c54d3ed8d","Susan Campbell Westerway  \nPhD (Medicine) DMU MAppSc AMS  \nPlease note the changes to the standard deviations for both head and abdominal circumferences.  \nI have adapted the technique of Deter et al (whose AC chart had been used by ASUM prior to mine) to simplify variability with gestational age. Thus, instead of having the SD at each week vary, the weeks have been grouped and the variations of standard deviations then averaged.  \nAustralasian Society for Ultrasound in Medicine  \nUltrasonic Fetal Measurement Standards for an Australian Population Compiled by Dr Susan Campbell Westerway – University of Sydney  \nGestation BPD OFD Head Abdominal Femur Humerus Gestation  \n(weeks) (mm) (mm) circ. Circ.(mm) (mm) (mm) (weeks)  \n+/-2 standard deviations shown in brackets.  \n\n| 11 | 16 (2.0) | 21 (2.0) | 59 (15) | 52 (10) | 8 (2.0) | 8 (3.0) | 11 |\n| --- | --- | --- | --- | --- | --- | --- | --- |\n| 12 | 20 (4.0) | 24 (2.0) | 70 (15) | 63 (10) | 10 (2.5) | 9 (2.0) | 12 |\n| 13 | 24 (4.0) | 29 (3.0) | 84 (15) | 74 (10) | 11 (2.5) | 11 (3.0) | 13 |\n| 14 | 28 (4.0) | 34 (3.0) | 96 (15) | 84 (10) | 15 (3.0) | 14 (4.0) | 14 |\n| 15 | 31 (4.0) | 38 (3.0) | 108 (15) | 96 (10) | 17 (3.5) | 17 (5.5) | 15 |\n| 16 | 36 (5.0) | 46 (3.0) | 128 (15) | 106 (10) | 22 (4.0) | 21 (4.0) | 16 |\n| 17 | 39 (5.0) | 50 (3.0) | 141 (15) | 120 (15) | 25 (4.0) | 25 (5.0) | 17 |\n| 18 | 42 (4.0) | 54 (3.5) | 151 (20) | 131 (15) | 28 (5.0) | 27 (5.5) | 18 |\n| 19 | 45 (5.0) | 57 (3.5) | 160 (20) | 140 (15) | 30 (5.0) | 29 (5.0) | 19 |\n| 20 | 47 (4.0) | 61 (3.5) | 170 (20) | 151 (15) | 32 (6.0) | 31 (5.0) | 20 |\n| 21 | 49 (4.0) | 63 (4.0) | 176 (20) | 164 (20) | 34 (6.0) | 32 (6.0) | 21 |\n| 22 | 52 (5.0) | 68 (3.5) | 188 (20) | 176 (20) | 37 (5.0) | 35 (6.0) | 22 |\n| 23 | 57 (5.0) | 76 (4.0) | 210 (20) | 186 (20) | 43 (5.0) | 38 (4.0) | 23 |\n| 24 | 60 (6.0) | 79 (4.0) | 220 (20) | 201 (20) | 45 (4.0) | 40 (6.0) | 24 |\n| 25 | 64 (6.0) | 82 (4.5) | 231 (20) | 212 (20) | 48 (5.0) | 43 (5.0) | 25 |\n| 26 | 67 (4.0) | 84 (4.5) | 238 (20) | 223 (25) | 49 (5.0) | 44 (4.0) | 26 |\n| 27 | 68 (5.0) | 86 (4.5) | 250 (20) | 230 (25) | 50 (5.0) | 47 (4.0) | 27 |\n| 28 | 72 (4.0) | 95 (5.0) | 263 (20) | 242 (25) | 54 (4.0) | 50 (5.0) | 28 |\n| 29 | 75 (4.0) | 97 (5.5) | 269 (25) | 259 (25) | 55 (5.5) | 51 (5.0) | 29 |\n| 30 | 76 (4.0) | 98 (5.5) | 274 (25) | 262 (25) | 58 (6.0) | 52 (5.0) | 30 |\n| 31 | 80 (6.0) | 101 (5.0) | 284 (25) | 272 (30) | 59 (5.5) | 54 (5.0) | 31 |\n| 32 | 81 (4.0) | 102 (5.0) | 288 (25) | 283 (30) | 62 (6.0) | 56 (5.0) | 32 |\n| 33 | 84 (6.0) | 107 (5.5) | 300 (25) | 294 (30) | 65 (4.0) | 57 (6.0) | 33 |\n| 34 | 86 (6.0) | 108 (5.5) | 305 (25) | 305 (30) | 66 (4.0) | 59 (5.5) | 34 |\n| 35 | 88 (6.5) | 109 (5.5) | 310 (25) | 315 (30) | 67 (6.0) | 60 (6.0) | 35 |\n| 36 | 90 (6.0) | 112 (5.5) | 317 (25) | 325 (35) | 69 (6.0) | 62 (5.0) | 36 |\n| 37 | 92 (6.5) | 113 (6.0) | 321 (25) | 333 (35) | 72 (5.0) | 63 (6.0) | 37 |\n| 38 | 93 (6.0) | 116 (5.5) | 328 (25) | 342 (35) | 73 (5.5) | 64 (6.0) | 38 |\n| 39 | 95 (8.0) | 119 (6.0) | 336 (25) | 356 (35) | 75 (6.0) | 65 (5.5) | 39 |\n| 40 | 96 (8.0) | 120 (6.0) | 340 (25) | 362 (35) | 76 (4.0) | 66 (6.0) | 40 |\n| 41 | 98 (8.0) | 122 (6.0) | 344 (25) | 367 (35) | 77 (5.0) | 68( 6.0) | 41 |\n\nThis cross sectional study collected 11,600 measurements from 3,800 women representing 70 nationalities. Figures are based on completed weeks of gestation.  \nCrown-rump length measurements (mm) at points in gestation (weeks/days)  \n\n| Gestation | CRL | Gestation | CRL | Gestation | CRL |\n| --- | --- | --- | --- | --- | --- |\n\n5.2  \n5.3  \n5.4  \n5.5  \n5.6  \n6  \n6.1  \n6.2  \n6.3  \n6.4  \n6.5  \n6.6  \n7  \n7.1  \n7.2  \n7.3  \n7.4  \n7.5  \n7.6  \n8  \n8.1  \n8.2  \n1 2  \n3 3  \n4 4  \n5 6  \n7 8  \n9  \n10  \n11  \n11  \n12  \n12  \n13  \n14  \n15  \n17  \n18  \n19  \n8.3  \n8.4  \n8.5  \n8.6  \n9  \n9.1  \n9.2  \n9.3  \n9.4  \n9.5  \n9.6  \n10  \n10.1  \n10.2  \n10.3  \n10.4  \n10.5  \n10.6  \n11  \n11.1  \n11.2  \n11.3  \n20  \n21  \n22  \n22  \n23  \n24  \n26  \n27  \n28  \n29  \n31  \n34  \n36  \n37  \n38 ","cbCaivY9sgs9YACf","https://ap.wps.com/l/cbCaivY9sgs9YACf","pdf",107919,"English","# Ultrasonic Fetal Measurement Standards for an Australian Population\n## Data collection and gestational age basis\n## Summary tables of +/- 2 standard deviations\n## Crown-rump length and gestation references\n## Regression analysis: CRL, BPD, OFD, HC, AC, FL, HL\n## Standard deviation regressions for fetal measurements","[{\"question\":\"How are the standard deviations for head and abdominal circumferences handled in these standards?\",\"answer\":\"The method groups gestational weeks and averages the variations of standard deviations, instead of varying SD at each individual week.\"},{\"question\":\"What data set underpins the fetal measurement standards?\",\"answer\":\"The cross-sectional study uses 11,600 measurements collected from 3,800 women representing 70 nationalities, based on completed weeks of gestation.\"},{\"question\":\"Which fetal measurements are modeled using regression analysis in the document?\",\"answer\":\"Regression equations are provided for crown-rump length (CRL) and for measurements including BPD, OFD, head circumference (HC), abdominal circumference (AC), femur length (FL), and humerus length (HL).\"}]","Ultrasonic Fetal Measurement Standards for an Australian Population - Compiled by Dr Susan Campbell Westerway | PDF",1792461932]