Weeks of gestination    Median
          15                    174
          16                    170
          17                    173
          18                    182 
          19                    198
          20                 222

Less than 1

Early follicul:5-28
Mid     "      :8-34
Late    "      :19-102
Mid cycle    :50-155
Early luteal :36-133
Mid Luteal  :13-160
Late   "      :7-90
IVF peak levels :354-1690
Post-ovulatory :6-16
Postmenopausal:<1