Questions & Answers about Tahlil için kan verdim.
In this sentence, tahlil means analysis, but in everyday medical Turkish it usually means a lab test or testing.
So Tahlil için kan verdim is naturally understood as:
- I gave blood for testing
- I gave a blood sample for analysis
A more explicit version would be Kan tahlili için kan verdim = I gave blood for a blood test.
Because için is the Turkish postposition meaning for.
Turkish uses postpositions, so the word comes after the noun:
- tahlil için = for analysis / for testing
With için, the noun is usually left in its basic dictionary form, so tahlil için is correct.