OB/GYN EXAM
STUDY GUIDE
Letty Shubin, MHA, RDMS, RVT
Sonostudy Hub
, ✨ Welcome to SonoStudy Hub ✨
Your Trusted Guide for OB/GYN Exam Success
Thank you for choosing SonoStudy Hub as part of your journey toward passing the ARDMS OB/GYN Exam and
growing your career in diagnostic medical sonography. This study guide was carefully crafted by a registered
sonographer someone who understands the challenges of ultrasound physics and what it takes to actually retain
the material. You’ll find not just practice questions, but clear explanations, helpful visuals, and practical strategies
for mastering even the trickiest topics.
Before You Dive In…
Whether you’re studying after a long shift or reviewing during a quiet moment, know this:
you’ve got this and this guide has your back.
If you love this resource, don’t forget to share your success or tag us on social media @SonoStudyHub. Your
journey inspires others!
Wishing you confidence, clarity, and a passing score.
— Letty Shubin, MHA, RDMS, RVT
Creator, SonoStudy Hub
This study guide covers the official ARDMS OB/GYN specialty exam domains, providing detailed content review,
key formulas/tables, and practice questions. The Abdomen exam assesses knowledge of abdominal organs and
superficial structures (like thyroid, breast, scrotum), including normal anatomy, physiology, pathology, and
sonographic techniques. The guide is organized by the exam content domains as outlined by ARDMS, with
expanded summaries and practice questions for each domain.
SonoStudy Hub 1
, Table of Contents
ARDMS OB/GYN Examination Study Guide .................................................................................... 3
Domain 1: Gynecology – Pelvic Anatomy and Physiology (19%) .............................................................. 4
Normal Pelvic Anatomy & Physiology .......................................................................................................................... 4
Common Gynecologic Abnormalities (Abnormal Physiology & Perfusion) .................................................................. 5
Domain 1 Practice Questions (Gynecology) ...............................................................................................................12
Domain 2: Obstetrics – First Trimester (12%) ........................................................................................ 15
Normal First Trimester Anatomy & Landmarks ..........................................................................................................15
First Trimester Abnormalities and Complications ......................................................................................................18
Domain 2 Practice Questions (First Trimester) ...........................................................................................................22
Domain 3: Obstetrics – Second/Third Trimester (37%) .......................................................................... 24
Normal Second/Third Trimester Anatomy & Biometry ..............................................................................................25
Fetal Abnormalities – Second/Third Trimester...........................................................................................................34
Domain 3 Practice Questions (Second & Third Trimester) .........................................................................................53
Domain 4: Protocols and Procedures (24%)........................................................................................... 59
Clinical Standards and Patient Care in Sonography ....................................................................................................59
Measurement Techniques – Gynecology ...................................................................................................................64
Measurement Techniques – Obstetric .......................................................................................................................66
Sonographer’s Role in Procedures..............................................................................................................................71
Domain 4 Practice Questions (Protocols & Procedures) ......................................................................... 74
Domain 5: Physics and Instrumentation (8%) ........................................................................................ 79
Domain 5 Practice Questions (Physics & Instrumentation) ........................................................................................81
Key Formulas and Values Summary (OB/GYN Sonography) ................................................................... 88
OB/GYN Study Guide – Answer Key ........................................................................................91
Domain 1: Gynecology (Q1–8) .......................................................................................................... 91
Domain 2: First Trimester (Q9–15) .................................................................................................... 91
Domain 3: Second/Third Trimester (Q16–33) ..................................................................................... 91
Domain 4: Protocols & Procedures (Q34–48) ..................................................................................... 92
Domain 5: Physics & Instrumentation (Q49–70) ................................................................................. 93
References............................................................................................................................................ 94
SonoStudy Hub 2
, ARDMS OB/GYN Examination Study Guide
Exam Content Outline and Domain Weights: The ARDMS Obstetrics & Gynecology (OB/GYN)
board exam covers a broad range of topics in sonography. It is organized into five domains
according to the official content outline, with approximate exam weightings as follows :
• Domain 1: Gynecology – Pelvic Anatomy & Physiology (19%) – Normal female pelvic
anatomy, physiology, and common gynecologic pathology.
• Domain 2: Obstetrics – First Trimester (12%) – Early pregnancy development, normal
first-trimester findings, and associated complications/abnormalities.
• Domain 3: Obstetrics – Second/Third Trimester (37%) – Detailed fetal anatomy in mid-
to-late pregnancy, fetal abnormalities (by organ system), amniotic fluid and growth
disorders, and placental/cord/maternal complications.
• Domain 4: Protocols and Procedures (24%) – Sonographic practice guidelines,
measurement techniques, patient care, and assisting with procedures.
• Domain 5: Physics and Instrumentation (8%) – Doppler hemodynamics in OB/GYN, use
of ultrasound modalities (M-mode, 3D, etc.), and safety principles (ALARA).
Each section below provides an expanded review of the domain, including key concepts and
diagnostic criteria. Key formulas are embedded in plain text for easy reference. Each domain
section concludes with practice multiple-choice questions (with an answer key provided at the
end). Images are included to illustrate important sonographic findings (e.g. normal anatomy and
pathologies) where relevant. This guide is intended for intermediate to advanced learners
preparing for the OB/GYN registry exam, and it emphasizes high-yield topics per the exam
content outline.
SonoStudy Hub 3
STUDY GUIDE
Letty Shubin, MHA, RDMS, RVT
Sonostudy Hub
, ✨ Welcome to SonoStudy Hub ✨
Your Trusted Guide for OB/GYN Exam Success
Thank you for choosing SonoStudy Hub as part of your journey toward passing the ARDMS OB/GYN Exam and
growing your career in diagnostic medical sonography. This study guide was carefully crafted by a registered
sonographer someone who understands the challenges of ultrasound physics and what it takes to actually retain
the material. You’ll find not just practice questions, but clear explanations, helpful visuals, and practical strategies
for mastering even the trickiest topics.
Before You Dive In…
Whether you’re studying after a long shift or reviewing during a quiet moment, know this:
you’ve got this and this guide has your back.
If you love this resource, don’t forget to share your success or tag us on social media @SonoStudyHub. Your
journey inspires others!
Wishing you confidence, clarity, and a passing score.
— Letty Shubin, MHA, RDMS, RVT
Creator, SonoStudy Hub
This study guide covers the official ARDMS OB/GYN specialty exam domains, providing detailed content review,
key formulas/tables, and practice questions. The Abdomen exam assesses knowledge of abdominal organs and
superficial structures (like thyroid, breast, scrotum), including normal anatomy, physiology, pathology, and
sonographic techniques. The guide is organized by the exam content domains as outlined by ARDMS, with
expanded summaries and practice questions for each domain.
SonoStudy Hub 1
, Table of Contents
ARDMS OB/GYN Examination Study Guide .................................................................................... 3
Domain 1: Gynecology – Pelvic Anatomy and Physiology (19%) .............................................................. 4
Normal Pelvic Anatomy & Physiology .......................................................................................................................... 4
Common Gynecologic Abnormalities (Abnormal Physiology & Perfusion) .................................................................. 5
Domain 1 Practice Questions (Gynecology) ...............................................................................................................12
Domain 2: Obstetrics – First Trimester (12%) ........................................................................................ 15
Normal First Trimester Anatomy & Landmarks ..........................................................................................................15
First Trimester Abnormalities and Complications ......................................................................................................18
Domain 2 Practice Questions (First Trimester) ...........................................................................................................22
Domain 3: Obstetrics – Second/Third Trimester (37%) .......................................................................... 24
Normal Second/Third Trimester Anatomy & Biometry ..............................................................................................25
Fetal Abnormalities – Second/Third Trimester...........................................................................................................34
Domain 3 Practice Questions (Second & Third Trimester) .........................................................................................53
Domain 4: Protocols and Procedures (24%)........................................................................................... 59
Clinical Standards and Patient Care in Sonography ....................................................................................................59
Measurement Techniques – Gynecology ...................................................................................................................64
Measurement Techniques – Obstetric .......................................................................................................................66
Sonographer’s Role in Procedures..............................................................................................................................71
Domain 4 Practice Questions (Protocols & Procedures) ......................................................................... 74
Domain 5: Physics and Instrumentation (8%) ........................................................................................ 79
Domain 5 Practice Questions (Physics & Instrumentation) ........................................................................................81
Key Formulas and Values Summary (OB/GYN Sonography) ................................................................... 88
OB/GYN Study Guide – Answer Key ........................................................................................91
Domain 1: Gynecology (Q1–8) .......................................................................................................... 91
Domain 2: First Trimester (Q9–15) .................................................................................................... 91
Domain 3: Second/Third Trimester (Q16–33) ..................................................................................... 91
Domain 4: Protocols & Procedures (Q34–48) ..................................................................................... 92
Domain 5: Physics & Instrumentation (Q49–70) ................................................................................. 93
References............................................................................................................................................ 94
SonoStudy Hub 2
, ARDMS OB/GYN Examination Study Guide
Exam Content Outline and Domain Weights: The ARDMS Obstetrics & Gynecology (OB/GYN)
board exam covers a broad range of topics in sonography. It is organized into five domains
according to the official content outline, with approximate exam weightings as follows :
• Domain 1: Gynecology – Pelvic Anatomy & Physiology (19%) – Normal female pelvic
anatomy, physiology, and common gynecologic pathology.
• Domain 2: Obstetrics – First Trimester (12%) – Early pregnancy development, normal
first-trimester findings, and associated complications/abnormalities.
• Domain 3: Obstetrics – Second/Third Trimester (37%) – Detailed fetal anatomy in mid-
to-late pregnancy, fetal abnormalities (by organ system), amniotic fluid and growth
disorders, and placental/cord/maternal complications.
• Domain 4: Protocols and Procedures (24%) – Sonographic practice guidelines,
measurement techniques, patient care, and assisting with procedures.
• Domain 5: Physics and Instrumentation (8%) – Doppler hemodynamics in OB/GYN, use
of ultrasound modalities (M-mode, 3D, etc.), and safety principles (ALARA).
Each section below provides an expanded review of the domain, including key concepts and
diagnostic criteria. Key formulas are embedded in plain text for easy reference. Each domain
section concludes with practice multiple-choice questions (with an answer key provided at the
end). Images are included to illustrate important sonographic findings (e.g. normal anatomy and
pathologies) where relevant. This guide is intended for intermediate to advanced learners
preparing for the OB/GYN registry exam, and it emphasizes high-yield topics per the exam
content outline.
SonoStudy Hub 3
