Have you heard of LIT? Here’s What You Should Know About This Immune-Based Fertility Treatment

If you've been facing recurrent miscarriage, implantation failure, or unexplained infertility, you may be wondering if your immune system could be playing a role.

One lesser-known but increasingly discussed option is Lymphocyte Immunization Therapy (LIT).

It's not part of the standard fertility workup and treatment but it may be helpful for some people with suspected immune-related issues.

You might consider LIT if:

• You've had multiple failed embryo transfers or miscarriages with no clear cause
• Your immune testing shows negative LAD (Leukocyte Antibody Detection) results
• You've been told you may have alloimmune factors affecting implantation
• You're working with a reproductive immunologist or have been referred for advanced immune testing

Lymphocyte Immunization Therapy (LIT)

LIT involves injecting your partner's white blood cells (lymphocytes) into your body. The goal is to help your immune system develop "blocking antibodies" that may help your body accept and support a pregnancy.

Leukocyte Antibody Detection (LAD) Testing

LAD (Leukocyte Antibody Detection) testing checks for the presence of these "blocking antibodies", sometimes called "anti-paternal" or "anti-leukocyte" antibodies. You'll likely have this test repeated over time to track your response.

In a healthy pregnancy, your immune system naturally creates these antibodies to help it tolerate the embryo (which is genetically part foreign because of the sperm).

Without blocking antibodies, the body may:

• Mistake the embryo as a threat
• Trigger an immune response that disrupts implantation or early development
• Lead to implantation failure or early loss

With blocking antibodies (positive LADs), your immune system is more likely to:

• Recognize the embryo as "safe"
• Promote immune tolerance
• ...