Abnormal Fetal tachycardia is defined as:
Fetal hea rate >= 160 bpm
Fetal hea rate >= 180 bpm
Fetal hea rate >= 200 bpm
None of the above
Fetal hea rate above 180bpm is considered as abnormal tachycardia. Refer page no 519 of Text book of obstetrics,sheila balakrishnan,2 nd edition.
Diagnosis in obstetrics