Don’t prescribe corticosteroids, IVIG, leukemia inhibitory factor or lymphocyte immunization therapy for patients undergoing IVF, those with a history of recurrent implantation failure or patients with recurrent pregnancy loss.

Multiple studies have demonstrated no improvement in live birth rate or clinical pregnancy rate with steroids, granulocyte colony-stimulating factor (GCSF), leukemia inhibitory factor (LIF) or immunoglobulin (IVIG) in those undergoing IVF or those with a history of recurrent implantation failure (RIF). In women with a history of recurrent pregnancy loss (RPL), there is evidence demonstrating no improvement in live birth rate with IVIG or lymphocyte immune therapy.
For more information:

Achilli C, et al. The role of immunotherapy in in vitro fertilization and recurrent pregnancy loss: a systematic review and meta-analysis. Fertil Steril 2018; 110(6):1089-1100. PMID: 30396553.

Boomsma CM, et al. Peri-implantation glucocorticoid administration for assisted reproductive technology cycles. Cochrane Database Syst Rev. 2012;13;(6):CD005996. PMID: 22696356.