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It's completely understandable to want answers as quickly as possible — waiting is one of the hardest parts of this process.

The good news is that FISH results are typically available within a few days. The test works by targeting DNA directly inside the cells, which makes it a relatively quick process without needing to Show Full Answer

It's completely understandable to want answers as quickly as possible — waiting is one of the hardest parts of this process.

The good news is that FISH results are typically available within a few days. The test works by targeting DNA directly inside the cells, which makes it a relatively quick process without needing to grow cells in a lab first. Also worth knowing — in most cases, the pathologist can use the cells from your original biopsy sample, so no additional procedure should be needed.

A borderline (2+) IHC result is actually quite common, and FISH is considered more precise, so it should give a clearer picture of your HER2 status. Once results are in, your care team can map out the best treatment path for you.

 AI-generated responses are not a substitute for medical advice. These services are not intended to diagnose, treat, or cure any condition or disease. Always ask your doctor about specific health concerns.

FISH and IHC Testing for HER2: Test Length, Results, and 5 Other Facts