Should it be:

"laboratory tests results" or "laboratory test results"

for doing different types of tests, not just one?

I feel the first one sounds weird, although I think it's correct grammatically.


The entire construction, 'laboratory test results' is a Noun Phrase

The count of 'test' isn't used, it stays singular.

We received 1000 laboratory test results
We received 1 laboratory test result

Only 'result' carries the count agreement.

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You can say

the results of laboratory tests

to avoid the awkwardness of "tests results"

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