If you are still on TCZ that affects the CRP & would show as ‘Normal’ that’s one of the ‘Risks’ if you get an infection it wouldn’t show up in the blood markers.
Someone who takes TCZ will know more, this is just something l remembered from a lecture l went too.
If you are on TCZ, then your ESR and CRP are meaningless - the TCZ stops the body producing the cytokine that causes the inflammation and raises the ESR and CRP. It is a basic fact that ESR and CRP cannot be used to assess disease activity when the patient is on TCZ - that seems to have passed someone by! Into the bargain, TCZ is only 100% successful in getting half of patients off pred - the other half continue to require a low dose of pred. That is because TCZ only targets one mechanism for creating the inflammation, biologic drugs only work on one thing and there are 3 possible causes for the inflammation in GCA.
Even without tocilizumab, the markers can lag well behind the symptoms, you can have symptoms with a small amount of inflammation - it needs a critical level to trigger the production of the proteins that give those raised markers, And up to 20% of patients are acknowledged to never have markers that go above the normal range - though that doesn't mean they aren't raised for them. Mine normal ESR is in low single figures, it chugged along at 16-18 for weeks during a major flare but no-one noticed as that is still within the range quoted by the lab. The normal range is the range of reading found in a very large population - 10,000+ - not that is OK in a single person.
Aching wrists and pain at the base of my thumb are infallible predictors of a flare for me.
It really isn't uncommon for 1mg pred - or less - to be enough to keep things under wraps but going to zero is a step too far and within weeks, or at most a few months, the symptoms start to creep up on you. Prof Dasgupta told us last summer that he often keeps patients at 2-3mg indefinitely as it reduces the risk of relapse. I think that is a tacit admission that in many people PMR lasts a long time at a low level - something that is accepted over most of mainland Europe.
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