<prompt> The cut-off point of serum estrogen level for the diagnosis of ovarian failure:10 pgmL20 pgmL30 pgmL40 pgmL  <response>: Ovarian failure diagnosis history of amenorrhea 35 years of age FSH40mIUL Estrogen20pgml karyotype anomaly organ specific humoral antibody ovarian biopsy D.C.DUTTA;S TEXTBOOK OF GYNAECOLOGY,g no:463,6th edition 