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.

Verdim means I gave.

It breaks down like this:

• ver- = give
• -di = past tense
• -m = I

So:

• verdim = I gave

Because Turkish usually does not need a separate subject pronoun when the verb already shows the person.

Here, the -m in verdim already means I.

So:

• Tahlil için kan verdim = I gave blood for testing

You could add ben if you want emphasis:

• Ben tahlil için kan verdim = I gave blood for testing

But normally ben is unnecessary.

This is because Turkish often leaves the direct object unmarked when it is indefinite, non-specific, or understood as a general substance.

Here, kan verdim is the normal expression for I gave blood / I gave a blood sample.

• kan verdim = natural
• kanı verdim = I gave the blood, referring to some specific blood already known in the conversation

In this medical context, kanı verdim would sound unnatural.

Literally, it means I gave blood, but in Turkish this is a very normal way to say that you provided a blood sample.

So in a hospital or clinic, kan verdim often corresponds to English:

• I had blood drawn
• I gave a blood sample

Turkish can also describe the same event from the other side:

• Benden kan aldılar = They took blood from me

Both are correct; they just frame the event differently.

No, Turkish word order is fairly flexible, but the verb usually stays at the end.

Tahlil için kan verdim is a natural order because it puts the purpose first:

• Tahlil için = for testing
• kan = blood
• verdim = I gave

You could also hear other orders, but they may sound more marked or conversational depending on what is being emphasized.

Not in this context.

Because of tahlil için (for testing), it clearly means giving blood as a sample.

If you want to say I donated blood, Turkish more clearly uses:

• Kan bağışladım = I donated blood

So:

• Tahlil için kan verdim = I gave blood for testing
• Kan bağışladım = I donated blood

Yes. That is completely correct and more explicit.

• Kan tahlili için kan verdim = I gave blood for a blood test

The shorter Tahlil için kan verdim is common because in medical situations the context usually makes it clear that tahlil means a lab test.

Yes, very common.

Kan vermek is the standard expression for:

• giving blood for medical testing
• giving blood as a sample
• sometimes donating blood, depending on context

So this sentence sounds natural and everyday, especially in a medical setting.