@entity1 chorionic gonadotrophin measurements in the luteal phase of the menstrual cycle of XXXX and fertile @entity1 .

@entity1 @entity778 @entity249
Serum @entity778 ( @entity778 ) determinations were performed every other day during the luteal phase of the menstrual cycle of 20 @entity1 suffering from @entity249 and of 20 @entity1 assumed to be fertile. @entity778 was determined by a specific radioimmunoassay which applied an antiserum directed against the @entity778 -beta subunit. The group of @entity249 @entity1 demonstrated detectable serum @entity778 in only three cases. No clinically confirmed pregnancies were achieved in this group. Eighteen of the 20 @entity1 presumed to be fertile showed detectable @entity778 levels. Five of these achieved ongoing pregnancies, while 13 @entity1 revealed increased @entity778 levels without delayed menstrual periods. The first day of detection of @entity778 during the luteal phase did not differ between the two groups. In the five @entity1 with ongoing pregnancies the time of detection of @entity778 ranged from day 5 until day 12 after ovulation. It is concluded that the high rate of increased @entity778 values in the fertile group may represent early conceptual loss, but the apparently disorderly @entity778 results indicate the need for cautious interpretation of @entity778 determinations during the luteal phase. Furthermore, early conceptual loss forms no major explanation for @entity249 .
