Hello Lou
You’ve come to the right place.
It is not “normal” to find any level of paraprotein in blood tests, BUT 4g per litre is a low level, a very low level compared to the levels people normally have when diagnosed with myeloma.
There is a pre cancerous condition called Monoclonal Gammopathy of Unknown Significance (MGUS) which is fairly common in the community, but most people with it don’t know they have it, as it doesn’t have symptoms- or necessarily cause problems. Some people just live with it forever. But in some cases it eventually develops into myeloma or chronic lymphocytic leukaemia (and all myeloma patients will have gone through this phase, but most were unaware). So people with low levels of paraprotein are monitored with blood tests to check that the level doesn’t get over 30g/l , or that they don’t develop any damage caused by the monoclonal cells, either high calcium levels (which can cause strokes), kidney damage, anaemia or bone lesions.
Some of us have physical damage at levels under 30g/l, but not at levels as low as 4g/l.
My myeloma came to light when I was diagnosed with thryoid issues too, but in my case had paraproteins of 32g/l.
Jane