DMS 220 Final Study Guide 2026 – Advanced Diagnostic
Medical Sonography Comprehensive Review
ALARA is used in all OB ultrasounds.
True
What is the importance of entering previous obstetric data into the patient chart?
Allows growth trending
What structure images after the yolk sac?
embryo
identify the blastocyst layer that eventually develops into the embryonic portion of the placenta
trophoblast
Where does the implantation of the embryo occur?
endometrium
Choose the quantitive pregnancy test
serum
What contributes to the maternal portions of the placenta?
decidua basilis
Normal chromosome number for an ovum?
22X or 22Y
Name the solid ball of developing cells that occurs after fertilization.
morula
An 18 year old presents to ED with complaints of profuse bleeding with positive home
pregnancy test. Clinical exam reveals dilated cervix. View the image and choose the differential
that fits the patient symptoms and sonographic findings.
impending abortion
identify the structure indicated by the arrow
, omphalocele
What best describes the sonographic findings of an embryonic demise?
lack of heart motion, expanded amnion sign, missing double bleb signs
Patient presents as small for gestational age with a known LMP 10 weeks ago. Exam reveals a
gestational sac equivalent to 6-week gestation. What is most likely differential?
blighted ovum
Abnormally fast heart rate
tachycardia
what sonographic findings increase suspicion of choriocarcinoma?
mass invasion through the myometrium to the serosa with hypoechoic liver lesions
What type of ectopic pregnancy is surrounded by less than 5mm of myometrium?
interstitial
A 30yo, G4P2A1 presents to ED with right lower quadrant pain. Her beta hCG is 1500, and she is
7 weeks by LMP. Sonographer images the double decidual sign, an embryo, and an endometrial
thickness of 9mm. The right ovary demonstrates increased color Doppler flow in a ring-like
pattern. What is the most likely differential for this patient's history and sonographic findings?
normal pregnancy
Which portion of the fallopian tube has the highest incidence of ectopic gestations?
ampullary
In a normal pregnancy, how long does it take the beta hCG to double?
48 hours
What is a risk factor for an ectopic implantation of pregnancy?
assisted reproductive therapy
What is a sonographic finding in the uterus which is made up of bleeding from the decidualized
endometrium?
pseudosac
Which type of ectopic pregnancy implants on previous cesarean scars?
intramural
Medical Sonography Comprehensive Review
ALARA is used in all OB ultrasounds.
True
What is the importance of entering previous obstetric data into the patient chart?
Allows growth trending
What structure images after the yolk sac?
embryo
identify the blastocyst layer that eventually develops into the embryonic portion of the placenta
trophoblast
Where does the implantation of the embryo occur?
endometrium
Choose the quantitive pregnancy test
serum
What contributes to the maternal portions of the placenta?
decidua basilis
Normal chromosome number for an ovum?
22X or 22Y
Name the solid ball of developing cells that occurs after fertilization.
morula
An 18 year old presents to ED with complaints of profuse bleeding with positive home
pregnancy test. Clinical exam reveals dilated cervix. View the image and choose the differential
that fits the patient symptoms and sonographic findings.
impending abortion
identify the structure indicated by the arrow
, omphalocele
What best describes the sonographic findings of an embryonic demise?
lack of heart motion, expanded amnion sign, missing double bleb signs
Patient presents as small for gestational age with a known LMP 10 weeks ago. Exam reveals a
gestational sac equivalent to 6-week gestation. What is most likely differential?
blighted ovum
Abnormally fast heart rate
tachycardia
what sonographic findings increase suspicion of choriocarcinoma?
mass invasion through the myometrium to the serosa with hypoechoic liver lesions
What type of ectopic pregnancy is surrounded by less than 5mm of myometrium?
interstitial
A 30yo, G4P2A1 presents to ED with right lower quadrant pain. Her beta hCG is 1500, and she is
7 weeks by LMP. Sonographer images the double decidual sign, an embryo, and an endometrial
thickness of 9mm. The right ovary demonstrates increased color Doppler flow in a ring-like
pattern. What is the most likely differential for this patient's history and sonographic findings?
normal pregnancy
Which portion of the fallopian tube has the highest incidence of ectopic gestations?
ampullary
In a normal pregnancy, how long does it take the beta hCG to double?
48 hours
What is a risk factor for an ectopic implantation of pregnancy?
assisted reproductive therapy
What is a sonographic finding in the uterus which is made up of bleeding from the decidualized
endometrium?
pseudosac
Which type of ectopic pregnancy implants on previous cesarean scars?
intramural
