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Pelvimetry

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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Pelvimetry is the measurement of the size of the pelvis, and hence the amount of space available for the fetus to squeeze through during birth.

Normal values are as follows:

  • Inlet: AP= 11.5 cm; transverse = 13.5 cm
  • Mid-cavity: AP= 12.5 cm; transverse = 12.5 cm
  • Outlet: AP = 13.5 cm; transverse = 11.5 cm

If on a radiograph the sizes appear to be significantly less than this, then there may be problems with obstructed labour.


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