Blood tests vary from very simple to extremely complex, extremely reliable to extremely variable and requiring no further action (as in your case) to requiring multiple possible further decisions.
Understanding the results of multiple medical blood tests requires some knowledge of multiple subjects including biochemistry, chemical pathology, microbiology and immunology.
There's also the question of what to do next - do you repeat the test, get additional blood tests, get other tests (such as radiology or biopsies) and most critically do you actually have a diagnosis and do you need treatment? (If so, what?)
Then there's the issue of false positives and false negatives which most people get wrong (especially if you're in a low prevalence population).
So yeah, I like to think we still add value.