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enseignants",{"title":54,"url":55},{"title":57,"url":58},{"title":186,"group":48,"menu":187},"Produit",[188,189,190,191,192,193,194],{"title":38,"url":7},{"title":65,"url":66},{"title":68,"url":69},{"title":71,"url":72},{"title":74,"url":75},{"title":15,"url":77},{"title":195,"url":10},"Tarification",{"title":197,"group":48,"menu":198},"Mentions légales",[199,200,201,202,203],{"title":197,"url":84},{"title":86,"url":87},{"title":89,"url":90},{"title":92,"url":93},{"title":95,"url":96},{"title":205,"group":48,"menu":206},"Service client",[207,208,209],{"title":101,"url":102},{"title":104,"url":105},{"title":107,"url":108},{"content":211,"related":296,"meta":362,"internal":373},{"title":212,"leadIn":213,"category":214,"elements":217,"becomeAnExpert":247,"author":287,"readDuration":228,"readDurationFormatted":295},"Gestational age ultrasound: crown-rump length and biparietal diameter","Learn how gestational age ultrasound is used to determine fetal age in early pregnancy using crown-rump length and biparietal diameter measurements.",{"id":215,"name":216},1,"Course previews",[218,229,234,242],{"type":219,"data":220},"video",{"readDurationInSeconds":221,"video":222},140,{"platform":223,"name":224,"url":225,"size":226},"YouTube","Early Pregnancy Ultrasound: Assessment of Gestational Age | Crown-Rump Length & Biparietal Diameter","https:\u002F\u002Fyoutu.be\u002Fdgk8uNfJnAQ",{"width":227,"height":228},200,113,{"type":230,"data":231},"free_text",{"readDurationInSeconds":232,"text":233},30.666666666666668,"\u003Cp>\u003Cspan>Accurate gestational age ultrasound depends on obtaining the correct image and making precise measurements. In this lesson, learn how to acquire the appropriate ultrasound views and accurately measure crown-rump length and biparietal diameter so you can confidently estimate gestational age during early pregnancy ultrasound.\u003C\u002Fspan>\u003C\u002Fp>\u003Cp>\u003Cspan>In this lesson from our \u003C\u002Fspan>\u003Ca href=\"https:\u002F\u002Fwww.medmastery.com\u002Fcourses\u002Ffirst-trimester-ultrasound-power-hour\">\u003Cspan>First Trimester Ultrasound Power Hour\u003C\u002Fspan>\u003C\u002Fa>\u003Cspan> course you'll learn how to:\u003C\u002Fspan>\u003C\u002Fp>\u003Cul>\u003Cli dir=\"ltr\" data-list-item-id=\"e69a73c1605d6f8ed36859dfa6c0971f4\">\u003Cspan>Perform gestational age ultrasound in early pregnancy\u003C\u002Fspan>\u003C\u002Fli>\u003Cli dir=\"ltr\" data-list-item-id=\"e28106cfab0ba02c50a6adf2c7d6f703f\">\u003Cspan>Select crown-rump length or biparietal diameter based on the stage of pregnancy\u003C\u002Fspan>\u003C\u002Fli>\u003Cli dir=\"ltr\" data-list-item-id=\"e873755779526a8083e3fe23dd9896caf\">\u003Cspan>Identify the correct view for crown-rump length measurement\u003C\u002Fspan>\u003C\u002Fli>\u003Cli dir=\"ltr\" data-list-item-id=\"ecd6540b06837fb790f24e7407007c146\">\u003Cspan>Estimate first-trimester gestational age using crown-rump length\u003C\u002Fspan>\u003C\u002Fli>\u003Cli dir=\"ltr\" data-list-item-id=\"e2844d69b3d4c1bf4fdf798c62eef8404\">\u003Cspan>Obtain the correct fetal skull view for biparietal diameter measurement\u003C\u002Fspan>\u003C\u002Fli>\u003Cli dir=\"ltr\" data-list-item-id=\"e685d066a71d44d2fc5d99bd0110e2cf8\">\u003Cspan>Estimate second-trimester gestational age using biparietal diameter\u003C\u002Fspan>\u003C\u002Fli>\u003C\u002Ful>",{"type":235,"data":236},"cta",{"readDurationInSeconds":237,"text":238,"buttonText":239,"buttonUrl":240,"teachIllustration":241},4.266666666666667,"Start the first chapter of our First Trimester Ultrasound Power Hour course for free","Start chapter 1 now","https:\u002F\u002Fwww.medmastery.com\u002Fuser\u002Fregister?target=%2Fcourses%2Ffirst-trimester-ultrasound-power-hour","https:\u002F\u002Fmedmastery-backend-prod-kjbeds.s3.eu-west-1.amazonaws.com\u002Fmedia\u002Fimages\u002F9e8fe329-8dab-493d-a56c-d7e8024287e6",{"type":230,"data":243},{"readDurationInSeconds":244,"title":245,"text":246},70.39999999999999,"Transcript","\u003Ch3 dir=\"ltr\" id=\"docs-internal-guid-5c040a51-7fff-a339-47dd-531a0bf03724\">\u003Cspan>Gestational age ultrasound\u003C\u002Fspan>\u003C\u002Fh3>\u003Cp dir=\"ltr\">\u003Cspan>[0:00]\u003C\u002Fspan>\u003Cbr>\u003Cspan>Once you've identified a definitive IUP [intrauterine pregnancy], you can further assess for gestational age by ultrasound. There are a few different techniques you can use. This will depend on the estimated gestational age. Early in pregnancy, in the first trimester, you will determine the gestational age using the crown-rump length. In your second trimester, you will measure the biparietal diameter of your fetus skull to estimate gestational age. Late in pregnancy, you can use the femur length to estimate gestational age.\u003C\u002Fspan>\u003C\u002Fp>\u003Ch3 dir=\"ltr\">\u003Cspan>First trimester ultrasound for gestational age\u003C\u002Fspan>\u003C\u002Fh3>\u003Cp dir=\"ltr\">\u003Cspan>[0:38]\u003C\u002Fspan>\u003Cbr>\u003Cspan>In this lesson, we will go over the first two techniques which you may use in an early pregnancy evaluation. Here we're seeing an image of a transabdominal pelvis study identifying a fetus within a gestational sac. Once you identify the fetus, fan through the image until you see the fetus in the longest cross-section. Freeze your image here.\u003C\u002Fspan>\u003C\u002Fp>\u003Ch3 dir=\"ltr\">\u003Cspan>Measuring crown-rump length in first trimester ultrasound\u003C\u002Fspan>\u003C\u002Fh3>\u003Cp dir=\"ltr\">\u003Cspan>[1:03]\u003C\u002Fspan>\u003Cbr>\u003Cspan>Next, take out your calipers and measure from the crown, or the top of the head, to the rump, which is essentially the bottom. If you are in the OB setting or abdominal setting of your ultrasound machine, you should be able to input this measurement to generate a gestational age.\u003C\u002Fspan>\u003C\u002Fp>\u003Ch3 dir=\"ltr\">\u003Cspan>Using biparietal diameter ultrasound in the second trimester\u003C\u002Fspan>\u003C\u002Fh3>\u003Cp dir=\"ltr\">\u003Cspan>[1:22]\u003C\u002Fspan>\u003Cbr>\u003Cspan>In the second trimester, you'll estimate gestational age on ultrasound using the biparietal diameter. To obtain that measurement, scan through the skull of your fetus. You want to hold your probe as perpendicular as you can to the skull of your fetus.\u003C\u002Fspan>\u003C\u002Fp>\u003Ch3 dir=\"ltr\">\u003Cspan>How to measure biparietal diameter on ultrasound\u003C\u002Fspan>\u003C\u002Fh3>\u003Cp dir=\"ltr\">\u003Cspan>[1:40]\u003C\u002Fspan>\u003Cbr>\u003Cspan>Scan through it until you see symmetric hemispheres, then freeze your image, and using your calipers, you want to measure it from the outer wall to the inner wall of your fetus skull. Inputting this measurement into your ultrasound machine should generate your estimated gestational age.\u003C\u002Fspan>\u003C\u002Fp>",{"courses":248,"showAwardsBelow":48},[249,269],{"id":250,"isFreeCmeCourse":251,"title":252,"type":253,"specialization":254,"teachers":256,"cmeCredits":258,"teacherIllustration":259,"backgroundImage":260,"relativeUrl":261,"lastChanged":262,"created":263,"description":264,"relativeURL":261,"meta":265},12786,false,"OB \u002F GYN Emergencies","course",[255],"Emergency medicine and critical care",[257],"Tori O’Daniel, MD FACOG",2,"https:\u002F\u002Fmedmastery-backend-prod-kjbeds.s3.eu-west-1.amazonaws.com\u002Fmedia\u002Fimages\u002F99f55ebb-4bbd-4da2-907b-6f76078b0259","https:\u002F\u002Fmedmastery-backend-prod-kjbeds.s3.eu-west-1.amazonaws.com\u002Fmedia\u002Fimages\u002F99f55ebb-fee6-4f05-82aa-62f78e96f836","\u002Fcourses\u002Fob-gyn-emergencies","1763556352","1690239029","Crack the code of OB \u002F GYN emergencies! In this course, you will learn how to perform thorough pelvic exams, recognize the symptoms of abnormal uterine bleeding, assess ectopic pregnancies, and more. You will master the treatment of non-critical issues, and quickly recognize patients who need an emergent consultation.",{"duration":266,"quizzes":267,"lessons":268},4712,4,25,{"id":270,"isFreeCmeCourse":251,"title":271,"type":253,"specialization":272,"teachers":274,"cmeCredits":276,"teacherIllustration":277,"backgroundImage":278,"relativeUrl":279,"lastChanged":280,"created":281,"description":282,"relativeURL":279,"meta":283},2977,"Point-of-Care Ultrasound Essentials",[273],"Ultrasound",[275],"Viveta Lobo, MD",5,"https:\u002F\u002Fmedmastery-backend-prod-kjbeds.s3.eu-west-1.amazonaws.com\u002Fmedia\u002Fimages\u002F99f55f72-8a1f-40e4-acaf-aac5e04e6fe8","https:\u002F\u002Fmedmastery-backend-prod-kjbeds.s3.eu-west-1.amazonaws.com\u002Fmedia\u002Fimages\u002F99f55eaf-bd8f-47ad-b8a5-9736fcdc77e5","\u002Fcourses\u002Fpoint-of-care-ultrasound-essentials","1763556386","1477402404","In this course, you’ll learn how to use point-of-care ultrasound (POCUS) to diagnose the most important problems seen in the acute care setting. Ideal for anyone who’s just starting to use POCUS—be it in the emergency department, general ward, ICU, or private clinic. Learn to use POCUS to increase your success rate, and decrease complications, when performing common procedures.",{"duration":284,"quizzes":285,"lessons":286},10724,13,65,{"id":288,"name":275,"image":289,"profession":290,"relativeUrl":293,"specializations":294},2976,"https:\u002F\u002Fmedmastery-backend-prod-kjbeds.s3.eu-west-1.amazonaws.com\u002Fmedia\u002Fimages\u002F9c43cefc-7f09-4a9a-9865-4aeea3cef318",{"name":291,"description":292},"Emergency medicine physician","\u003Cspan id=\"docs-internal-guid-57fc7959-7fff-8d74-e680-4d8102bdd254\">Associate Professor, Department of Emergency Medicine at Stanford University Medical Center in California, USA.\u003C\u002Fspan>","\u002Fteachers\u002Fviveta-lobo-md",[273],"2m",[297,324,343],{"id":298,"title":299,"text":300,"image":301,"author":309,"path":317,"readDuration":318,"readDurationFormatted":319,"internal":320},1352,"Injectable cholesterol medication: using PCSK9 inhibitors","Not all patients reach their LDL targets with oral therapy. Learn when injectable cholesterol medication helps and how PCSK9 inhibitors work.",{"alt":302,"title":303,"size":304,"location":306},"Two PCSK9 inhibitor autoinjector pens—an injectable cholesterol medication—shown on a light blue background.","",{"width":305,"height":305},900,{"bucket":307,"key":308},"public-drupal-medmastery-assets-production","\u002F2026-05\u002FC121(3)_magazine image.png",{"id":310,"title":311,"relativeURL":312,"image":313,"professionLong":314,"profession":315,"weight":267},1563,"Franz Wiesbauer, MD MPH","\u002Fteachers\u002Ffranz-wiesbauer-md-mph","https:\u002F\u002Fmedmastery-backend-prod-kjbeds.s3.eu-west-1.amazonaws.com\u002Fmedia\u002Fimages\u002F9c43cef0-41ee-4005-9e4a-d8711c816401","Franz is the founder and CEO of Medmastery. 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Learn to recognize and report it with exercise stress ECG.",{"alt":348,"title":303,"size":349,"location":351},"Illustration of the heart's coronary vasculature showing large coronary arteries and the extensive network of smaller vessels affected in INOCA (ischemia with nonobstructive coronary arteries).",{"width":350,"height":350},1200,{"bucket":307,"key":352},"\u002F2026-05\u002FC17(1)_magazine image_0.png",{"id":310,"title":311,"relativeURL":312,"image":313,"professionLong":314,"profession":354,"weight":267},{"name":316},"\u002Fmagazine\u002Fexercise-stress-ecg-inoca",141,"3m",{"created":359,"updated":360,"published":361},1778115738,1778799792,1778118255,{"seo":363,"og":366},{"title":364,"description":365},"Gestational Age Ultrasound in Early Pregnancy Evaluation | Medmastery","Learn how to obtain the correct ultrasound views and accurately measure crown-rump length and biparietal diameter to estimate gestational age.",{"title":364,"description":365,"image":367},{"alt":368,"title":303,"size":369,"location":371},"Gestational age ultrasound image demonstrating crown-rump length measurement in the first trimester",{"width":350,"height":370},630,{"bucket":307,"key":372},"\u002F2026-05\u002FC144(1)_Open graph_1200x630.png",{"id":374,"created":375,"updated":376,"published":376},1353,1780168728,1780169720]