I have a question, please!

On my blood test paper is written:
method of work limit of detection in the field of linearity ( measurable ) 45 UI/ml
analytical sensitivity 15 UI/ml
Why the measurable limit of detection is not equal with the sensitivity? When UND the viral load is < then 15 UI/ml or <45 UI/ml?
Thanks!
I just want to know how good is my lab.
HCV since I don't know. Diagnosed in 2010.
GT1b, F0/F1, VL 9M, ALT 44, AST 42, Tx naive,
started 12 wks Twinvir on 06.12.2015. Feeling great and grateful

virus not detected 06.02.2016 & SVR24
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