Urine results and Bence Jones

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Hi, I'm not new to MacMillan, I had BC last year, but I'm new to the myeloma forum. Around August/September  last year my hubby started with frothy urine. I was in the middle of my treatment so he didn't say anything. Also has protein, eventually saw our GP early November who referred for a urgent appointment to nephrology. 

He had the appointment September this year, urine and blood tests.  The consultant phoned him mid October to say he was referring him to haematology as he had protein that was coming from his bone marrow.

We've seen the Nephrology urine results, given to us via the GP receptionist yesterday.

Urine light chain level:

Positive: Bence Jones protien detected.


Urine Paraprotein level:

Free kappa light chains. Intact IgG kappa also present.

No figures for either but figures are on the rest of the urine tests. Not had the blood test results done on the same day. 

Do you think it's likely it will be multiple myeloma, I have read its rare to have a false positive for Bence Jones.
Any help would be appreciated, many thanks