Wanna bet?
I scored a script from a doc who had all kinds of dumb plaques on his wall "best professor " blah blah. Not all docs test a whole bunch. He ordered 2 tests before giving me trt, then he ordered two after. now just once a year. thats it. In fact it would only been once after but i made him raise the dose
Each doc is dif i guess.
To the OP, are you saying you are running your test with your deca, and your levels are still low?. Odd. If you inject both they should be both there.
What MIGHT be happening is, perhaps your TRT has never totally shut you down.. So to take a generic number lets say with your shots you are at 600ng/dl. But, lets say the shots are supplying 400 of that and your balls are still petering out 200ng/dl. Now deca can reduce test levels to nuthin in almost a few days. So if you added deca, your 200ng/dl would be gone and your at 400 now. now most docs would not see 400 as deficiant but these numbers are just for demo purposes, but you see what could be happening here. Depending on what day you got your blood test, even with the example of 400...400 could be your high...even with a once week injecting frequency you might have 50%fluctuation in your levels (which is why bi weekly is best with test E or C) so maybe you took bloods to late after the shot. Ideally bloods should be taken 2-4 days post shot to get your "high", tho its nice to know your "low" too.
So you could do 2 things here: A. Tell him you took bloods 6 days after the shot, and you probably just got the "low"....or B.) you could do what i'd do

YES baffle him, make him raise your dose! "Jee doc i guess my metabolism changed. Nothings impossible i guess"
Just look innocent
good luck