FHR auscultation sites: RSA & LSA

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When you're talking about FHT auscultation, what do RSA & LSA stand for? Is it "right/left sinciput anterior"?

Thanks!

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Specializes in Education, FP, LNC, Forensics, ED, OB.

S=sacrum

Sacrum Anterior (SA) means the fetal sacrum is closest to the mother's symphysis.

Left Sacrum Anterior (LSA) means the fetal sacrum is closest to the mother's symphysis and rotated slightly to the mother's left (clockwise from direct SA).

Right Sacrum Anterior (RSA) means the fetal sacrum is closest to the mother's symphysis and rotated slightly to the mother's right (counterclockwise from direct SA).

http://www.brooksidepress.org/Products/OBGYN_101/MyDocuments4/Text/AbnormalLD/fetal_position.htm

I've not read all the way through the following PDF, but has good info on cardinal movements/passenger, etc:

http://academic.cuesta.edu/atorrey/ld.pdf

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