Ultrasound: Pelvic: Difference between revisions
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==OB== | ==OB== | ||
[[File:yolk sac.jpg|thumbnail|In a normal pregnancy, the gestational sac appears as a hypoechoic structure encircled by an echogenic border within the endometrial cavity at 4-5 weeks]] | |||
Definite IUP = gestational sac containing yolk sac | Definite IUP = gestational sac containing yolk sac | ||
*Occurs ~5.5th week | *Occurs ~5.5th week | ||
Revision as of 19:38, 23 September 2014
OB
Definite IUP = gestational sac containing yolk sac
- Occurs ~5.5th week
- MUST contain yolk sac to be confirmed IUP. Pseudogestational sac possible in ectopic pregnancy
- B-HCG below Discriminatory Zone = <1,500-3,000 mIU/ml
- Consider Transabd US for IUP: >6000 mIU/ml
Endometrial mantle
- normal size > 8 mm
Fetal Heart Rate
- normal 120-160
- Use M-mode to calculate
Estimated gestational age
- can be measured by crown rump length, femur length, biparietal diameter, etc.
- depends on gestational age and quality/type of image aquired
Nonpregnant
- Ovarian Torsion
- increased risk with cyst(s) > 5mm
- Want to visualize arterial and venous flow
Diagnostic Algorithm
See Also
Source
- Sonoguide
- Barnhart KT. Ectopic Pregnancy [clinical practice]. N Engl J Med. 2009;361(4):379-387.