A firm digital pressure on head or a gentle pinch of fetal head with atraumatic clamp is used for stimulation. An acceleration of the fetal heart rate of 15 bpm lasting at least 15 seconds is suggestive of normal fetal outcome.
^Clark, SL; Gimovsky, ML; Miller, FC (Feb 1, 1984). "The scalp stimulation test: a clinical alternative to fetal scalp blood sampling.". American Journal of Obstetrics and Gynecology148 (3): 274–7. doi:10.1016/s0002-9378(84)80067-8. PMID6695974.