How to measure the basin size

fail do to all pregnant women the procedure of measurement of basin. The bone basin and fabrics which cover it are the patrimonial channel. On it the kid is born. Natural appearance of the child or need for carrying out operation depends on the sizes of basin. As to measure the basin size?

Instruction

1. You conduct research of basin first of all by survey and palpation. At survey pay attention to all area of basin. Especially carefully study sacral rhombus, its form in total with other data gives the chance to judge the structure of basin.
2. After survey you pass directly to measurement. As internal parts of basin are in most cases unavailable to measurements, measure usually external sizes and on them judge form and size of small pelvis. Take the special tool — tazomer. It is similar to compasses which are supplied with scale with the put divisions in centimeters. The ends of tazomer have the buttons which are put to places between which the distance is measured.
3. Begin measurement with distance spinarum. This distance between front upper awns of podvzdoshny bones. This size usually is 25-26 cm.
4. You pass to measurement of distance kristarum further. Tazomer have in the most remote points of crests of podvzdoshny bones. The average size of this distance is 28-29 cm.
5. The next stage — measurement of distance of trekhanterik. This distance is measured between big spits of femurs. Its size is 31-32 cm.
6. Now measure ex-sloe conjugate. It is the direct size of basin, i.e. external conjugate. For this purpose the pregnant woman needs to be laid sideways, to bend underlying leg in knee and coxofemoral joints. Extend leg which lies from above exactly. The normal sizes of external conjugate are 20-21 cm. Its size is important, by the sizes of external conjugate it is possible to judge the smallest size in basin — true conjugate. This distance between the most acting points in sacrum and on internal surface of pubic symphysis. Exactly there will pass the fruit head here. That to calculate it, from the size of external conjugate take away 9 cm. If the value less, than 10.5 cm turns out, then childbirth is complicated in the natural way or is even impossible.
7. In need of obtaining additional data on the sizes of basin pass rentgenopelviometriya — radiological research of basin. But it can be done not earlier than the termination of the third trimester of pregnancy when all bodies and fabrics of fruit are already created.
8. But the simplest and available method is measurement by centimetric tape of luchezapyastny joint on its circle. It gives the chance to consider thickness of bones of basin. If the wrist is more than 14 cm, then bones including massive and internal dimensions it is much less basin, than show measurements of big basin.
9. But at modern achievements of medicine the narrow basin is not problem for the woman in labor. It is necessary to take all corresponding measurements only in time successfully to be prepared for childbirth.