How rare is it to have a negative AL serum test but monoclonal protein found only once in urine?
It's not extremely rare to have this pattern, though it can make diagnosis more complex. Here's what you should know:
Finding monoclonal proteins alone isn't enough to diagnose AL amyloidosis. Blood tests like serum protein Show Full Answer
How rare is it to have a negative AL serum test but monoclonal protein found only once in urine?
It's not extremely rare to have this pattern, though it can make diagnosis more complex. Here's what you should know:
Finding monoclonal proteins alone isn't enough to diagnose AL amyloidosis. Blood tests like serum protein electrophoresis (SPEP) and the more sensitive immunofixation electrophoresis (IFE) look for these abnormal proteins, but they don't always catch everything.
Sometimes monoclonal proteins appear in urine but not consistently in blood tests, or they may show up intermittently. This can happen because:
- The amount of abnormal protein being produced varies
- Different tests have different sensitivity levels
- The protein may be filtered more into urine than circulating in blood
If AL amyloidosis is suspected despite negative or inconsistent test results, your doctor will likely recommend additional testing. This typically includes:
- Repeating blood and urine tests
- A tissue biopsy (often kidney or bone marrow) to look for amyloid deposits
- Imaging tests to check for organ involvement
The key point is that a single finding of monoclonal protein in urine, even with negative serum tests, warrants further investigation to determine what's happening in your body.
January 26
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