MyAmyloidosisTeam

That's a really important question, and honestly, a frustrating journey to get to your diagnosis. The short answer is that biopsies don't always catch amyloid deposits, even when they're present.

Here's why the bone marrow biopsy can come back negative:

- Amyloid deposits are not evenly spread throughout the body — they Show Full Answer

That's a really important question, and honestly, a frustrating journey to get to your diagnosis. The short answer is that biopsies don't always catch amyloid deposits, even when they're present.

Here's why the bone marrow biopsy can come back negative:

- Amyloid deposits are not evenly spread throughout the body — they can be patchy or concentrated in certain organs
- The small tissue sample taken during a biopsy may simply miss the areas where amyloid has built up
- In AL amyloidosis, the heart can sometimes be more heavily affected than the bone marrow The fat pad biopsy also works similarly — it samples a small area, so if amyloid hasn't deposited heavily there, it can return a false negative too.

This is exactly why doctors often use multiple tests together. A cardiac biopsy is considered the most accurate way to confirm cardiac involvement, with a success rate between 87% and 98%.

The key takeaway is that a negative biopsy doesn't rule out AL amyloidosis — it just means amyloid wasn't found *in that spot*. Your cardiac biopsy ultimately told the real story.

 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.

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