Not so simple for others.
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.
For some stuff a large amount of interpretation is needed, for a simple PCR test it is not needed 99.99% of the time. The possible interpretations have already been entered and the doc selects one based on the result. It could be automated, but against the law since the doc has to do it. There is that 0.01% chance that something else is going on and the doc will pick up on it when seeing other results/patient history and will end up writing additional interpretation or something very different.
However, that result is rarely seen by a patient. It goes back to the treating physician who then reads it and interprets it himself and uses to guide treatment.