The contraction stress test (CST):
1. sometimes employs vibroacoustic stimulation.
2. is an invasive test however contractions are stimulated.
3. is considered negative if no late decelerations are observed with the contractions.
4. is more effective than NST if membranes have already been ruptured.
3
1. Incorrect. Vibroacoustic stimulation is sometimes used with NST.
2. Incorrect. CST is invasive if stimulation is by IV oxytocin but not if by nipple stimulation.
3. Correct. No late decelerations is good news.
4. Incorrect. CST is contraindicated if membranes have ruptured.
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