Falsely elevated steroidal assay levels related to heterophile antibodies against various animal species.

@article{Check1995FalselyES,
  title={Falsely elevated steroidal assay levels related to heterophile antibodies against various animal species.},
  author={Jerome H. Check and L Ubelacker and C C Lauer},
  journal={Gynecologic and obstetric investigation},
  year={1995},
  volume={40 2},
  pages={139-40}
}
Two cases of falsely elevated serum estradiol and 1 case of spuriously elevated serum progesterone performed on an automated immunoassay instrument are described. Further testing of same specimens indicated the presence of heterophilic antibodies against rabbit IgG and sheep IgG, respectively.