RDMS OB/GYN study plan

Identify normal first-trimester landmarks (gestational sac, yolk sac, amnion, embryonic pole, chorion frondosum) and state the menstrual-age window in which each becomes visible

Calculate and apply mean sac diameter and crown-rump length dating rules, including the thresholds at which each is preferred

State the criteria for documenting embryonic/fetal cardiac activity and the age at which it should be detectable transvaginally

Differentiate a normal intrauterine pregnancy from a pseudogestational sac using location, shape, and decidual reaction descriptors

Sequence a systematic transabdominal-then-transvaginal first-trimester protocol and justify each step

Classify early pregnancy failure by sonographic criteria (anembryonic, embryonic demise, inevitable, incomplete, complete, missed) and match each to its findings

Construct a diagnostic pathway for the patient with a positive hCG test and an empty uterus, ordering the differential by likelihood and hCG level

Distinguish tubal, interstitial, cervical, ovarian, and cesarean-scar ectopic locations by anatomic landmarks

Recognize sonographic features of hydatidiform mole and retained products of conception, and state the pitfalls that mimic each

Compare first-trimester physiologic findings (corpus luteum cyst, subchorionic hematoma, prominent amnion) against true pathology

Execute a fetal anatomic survey in a fixed sequence, naming each required structure and the plane used to show it

Obtain and verify the standard biometry planes for BPD, HC, AC, and FL, and list the landmarks that confirm each plane is correct

Select the correct growth chart and formula logic when biometry values disagree with menstrual dates

Identify normal fetal cardiac situs, four-chamber view, and outflow-tract relationships as screening landmarks

Recognize normal amniotic fluid, placental, and umbilical cord appearances at the second- and third-trimester scan

Group major fetal anomalies by organ system (CNS, face, cardiac, GI, renal, skeletal, abdominal wall) and state the single most characteristic finding for each

Distinguish anomalies detectable in the first trimester from those that typically appear later, and explain why timing matters

Differentiate markers (echogenic focus, pyelectasis, choroid plexus cyst, short femur) from structural anomalies in terms of follow-up implications

Relate placental location, cord insertion, and amniotic fluid volume to fetal anomaly associations

Interpret a combined finding pattern (e.g., ventriculomegaly plus growth restriction) and rank the differential

Determine chorionicity and amnionicity in multiple gestation using membrane thickness, twin-peak sign, and lambda sign, and state the gestational age at which each is most reliable

Apply the criteria for placenta previa, low-lying placenta, and marginal versus velamentous cord insertion, including the transvaginal approach

Measure and interpret deepest vertical pocket and amniotic fluid index, and classify oligohydramnios and polyhydramnios with their thresholds

Differentiate symmetric from asymmetric growth restriction and select the Doppler studies used to monitor each

Distinguish the complications unique to monochorionic twins (TTTS, TRAP, sIUGR) by their defining sonographic features

Measure uterine dimensions, endometrial thickness, and myometrial appearance using a standardized technique and state normal ranges by menstrual phase

Differentiate fibroids, adenomyosis, endometrial polyps, hyperplasia, and carcinoma by their sonographic descriptors

Characterize adnexal masses using morphologic descriptors (size, septations, solid components, papillary projections, acoustic features) and classify as benign-appearing versus suspicious

Distinguish hemorrhagic cyst, endometrioma, dermoid, and simple cyst by internal echo pattern and through-transmission

Recognize the sonographic signs of ovarian torsion and pelvic inflammatory disease and state the urgency of each

Explain the ALARA principle and the roles of thermal index and mechanical index in obstetric scanning, and select settings that reduce fetal exposure

Adjust 2D, color, and spectral Doppler settings (gain, PRF/scale, wall filter, focal zone, frequency) to resolve specific image problems

Identify common artifacts (shadowing, enhancement, reverberation, mirror image, side lobes, aliasing) and state the corrective action for each

Describe the sonographer's role in and contraindications for amniocentesis, chorionic villus sampling, sonohysterography, and follicular monitoring

Explain aseptic technique, consent elements, and documentation requirements for image-guided gynecologic procedures

Integrate all five domains by working mixed-topic questions under timed conditions that mirror the real exam

Re-drill the highest-frequency misses from the weeks 2, 4, 6, and 7 error logs until each is answered correctly twice

Rehearse rapid recall of numeric thresholds (dating criteria, fluid indices, endometrial and adnexal measurements) from memory

Practice eliminating answer choices by identifying the single sonographic feature that separates the top two differentials

Finalize a test-day plan covering timing, question pacing, and strategy for flagged items