ch 50 ob measurements

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Author:
rbeacr
ID:
139434
Filename:
ch 50 ob measurements
Updated:
2012-03-03 22:11:59
Tags:
ob mesurements gest age
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Description:
ob measurements and gest age
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  1. fetal age
    • also conceptional age
    • when conception is known
    • add 14 days for menstural
  2. last menstural peroid
    menstural age or gestational age
  3. double decidual sac sign
    • 4weeks
    • small hypo echoic area in fundus
    • surrounded by echogenic rim
  4. yolk sac should be seen at ? mm
    8
  5. yolk sac job
    • early transfer of nutrients from tropoblast to embryo
    • aid in early formation of primitive gut
  6. yolk sac size
    • 6-7mm
    • 8 or bigger poor outcome
    • solid or echogenic also have poor outcome
  7. cardiac activity msd
    16mm
  8. gest sac accuracy
    + - 2 to 3 weeks
  9. CRL
    most accurate way to age 1st tri pregnancy
  10. accuracy of crl
    + - 5 days
  11. calculate gest age
    GA= CRL in cm + 6
  12. CRL used up until
    12 weeks
  13. EHR
    • Embryonic hear rate
    • accelerated 5-9th week
  14. calculate embryonic age with HR
    LMP (days) = EHR x .3 + 6 days

    + - 6 days accuracy
  15. BPD
    • Bipariental diameter
    • + - 2-3 weeks
    • best up to 26 weeks
    • outter edge to outter edge
  16. bpd at level of
    • thalamus
    • cavumsepti pellucidum
    • falx cerebri
    • choroid plexus in atrium of lateral ventricle
  17. bracycephaly
    • round
    • wider than tall head
  18. dolicephaly
    • flattened or compressed
    • taller than wide
  19. growth adjusted sonar age
    • bpd at 20-26
    • bpd at 31-33
    • compare growth average
    • small average or large percentile
    • + - 3 days
  20. oxycephaly
    • premature closing of sutures
    • cone shape head
  21. HC
    • Head circumference
    • more accurrate than bpd
    • leading edge to leading edge
    • same level of bpd
    • + - 2/3 weeks
  22. platycephaly
    flattening of vertex of skull
  23. doli and bracy with oxy and platy
    • doli goes with oxy
    • brachy goes with platy
  24. chc
    • coronal head circumference
    • perpendicular to hc plane
    • includes thalamus
    • triagular
  25. CI
    • cephalic index
    • CI= BPD/OFD x 100
    • compensate for bracy >85 and doly <75
    • gives a percent
    • 75-85% normal
  26. AC
    • abdominal circumference
    • detenct IUGR
    • estimate weight more than age
    • measured at trv plane level of liver, umb vein, stomach
    • more circular than oval
    • largest variability of measurements
  27. HC and AC formula
    D1+D2 X PIE/ 2 or (D1+D2) x 1.57
  28. FL
    • femur legnth
    • accurate at BPD
    • useful when head cant be measured
    • measure diaphysis
    • not head of femur
  29. shortened femur and humerous
    • dwarfism
    • heredity growth factors
    • image other bones
  30. sga
    small for gestational age
  31. which is longer tibia or fibula
    tibia
  32. ulna and radius
    which is longer
    • ulna
    • larger and medial
  33. ara
    • age range analysis
    • not all parameters grow at the same rate

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