Davalac krvi ima dovoljnu telesnu težinu.

Davalac literally means giver or donor. It comes from the verb davati = to give.

In davalac krvi, it means blood donor.

This word is correct and standard, especially in formal or medical contexts. In everyday speech, Serbian speakers may also say donor krvi, which sounds a bit more international and is also very common.

So:

• davalac krvi = blood donor
• donor krvi = blood donor

Both are understood, but davalac sounds a little more native/Serbian in formation.

Because krvi is the genitive singular form of krv (blood).

After a noun like davalac (donor/giver), Serbian usually uses the genitive to show what is being donated:

• davalac krvi = donor of blood
• literally: giver of blood

This is very normal in Serbian. English often uses a noun directly in front of another noun (blood donor), but Serbian commonly uses a noun + genitive structure instead.

A few similar patterns:

• čaša vode = a glass of water
• flaša vina = a bottle of wine
• davalac organa = organ donor

So krvi is there because it means of blood.

Because Serbian uses imati (to have) in this sentence, not biti (to be).

The phrase ima dovoljnu telesnu težinu literally means has sufficient body weight.

In English, you might sometimes say:

• The donor has sufficient body weight
• or more naturally in some contexts: The donor is heavy enough

Serbian chooses the has structure here. That is completely natural.

So:

• ima = has
• je = is

This sentence is built around possession of a quality/requirement, not identity.

Because dovoljnu agrees with težinu, which is:

• feminine
• singular
• accusative

The adjective dovoljan (sufficient/enough) changes its ending to match the noun it describes.

Here are the relevant forms:

• dovoljan = masculine
• dovoljna = feminine nominative
• dovoljnu = feminine accusative

Since težina is feminine, and it is the direct object of ima, it appears in the accusative:

• nominative: dovoljna telesna težina
• accusative: dovoljnu telesnu težinu

So dovoljnu is not random—it matches the grammar of težinu.

Because the whole phrase dovoljnu telesnu težinu is in the accusative singular feminine.

Here is the structure:

• dovoljnu = sufficient
• telesnu = bodily/body
• težinu = weight

The noun težina is feminine, and since it is the direct object after ima, it goes into the accusative: težinu.

The adjective telesna must agree with težina, so it also becomes accusative feminine singular: telesnu.

So all three words match:

• dovoljnu
• telesnu
• težinu

This is a good example of adjective agreement in Serbian.

The base, dictionary-style form is telesna težina.

That is the nominative singular form:

• telesna težina = body weight

In the sentence, it changes because it is the object of ima:

• nominative: telesna težina
• accusative: telesnu težinu

This kind of change is very common in Serbian and is one of the main things English speakers have to get used to.

Yes, telesna težina is a normal and correct expression for body weight.

However, depending on context, Serbian speakers may also simply say težina if the meaning is obvious:

• Ima dovoljnu težinu. = He/She has sufficient weight.

But in formal, medical, or administrative language, telesna težina is more precise, because it clearly means body weight, not the weight of an object.

So in a medical or blood-donation context, telesna težina sounds especially appropriate.

Yes. Serbian word order is more flexible than English word order because cases show the grammatical roles.

The sentence:

• Davalac krvi ima dovoljnu telesnu težinu.

is neutral and perfectly natural.

But other orders are possible, for example for emphasis:

• Dovoljnu telesnu težinu ima davalac krvi.
• Davalac krvi dovoljnu telesnu težinu ima.

These are grammatically possible, but they may sound more marked, emphatic, or less neutral depending on context.

For a learner, the original order is the safest and most standard.

Yes, it sounds fairly formal, official, or medical.

That comes from several choices:

• davalac krvi instead of a more casual wording
• dovoljnu
• telesnu težinu

It sounds like something you might read in:

• a medical form
• blood donation requirements
• health guidelines
• official instructions

In casual speech, a person might say something simpler, depending on context.

Yes, that is possible, but it is not exactly the same in tone.

• Davalac krvi ima dovoljnu telesnu težinu.
  = formal, medical, official-sounding

• Davalac krvi je dovoljno težak.
  = more direct, more everyday, literally The blood donor is heavy enough

The second version may sound a bit less technical and can feel more personal or physical. In medical rules or institutional language, ima dovoljnu telesnu težinu is usually the better choice.

So both can work, but they are different in style.

Because Serbian has no articles.

English says:

• a blood donor
• the blood donor

Serbian does not use words equivalent to a/an/the in the same way. Whether the meaning is definite or indefinite is understood from context.

So Davalac krvi can mean, depending on context:

• a blood donor
• the blood donor
• blood donors in a generic sense, if used in the right kind of statement

In this sentence, it likely means something general, like A blood donor has / must have sufficient body weight.

It can easily sound like a requirement, especially in the right context.

Grammatically, the sentence simply says:

• A blood donor has sufficient body weight.

But in medical or administrative language, present tense statements often express general conditions or eligibility rules. So it may imply:

• A blood donor must have sufficient body weight
• A blood donor is required to have sufficient body weight

This is common in Serbian, especially in formal guidelines.

You can tell from both meaning and case/form.

• Davalac krvi is the subject: the donor
• ima = has
• dovoljnu telesnu težinu is the direct object: sufficient body weight

Why?

1. Davalac is in its basic subject form.
2. Težinu is in the accusative, which is very commonly used for direct objects.
3. The verb imati normally takes an object: you have something.

So the structure is:

• subject: Davalac krvi
• verb: ima
• object: dovoljnu telesnu težinu

They are in different cases for different reasons:

• krvi = genitive singular
• težinu = accusative singular

Why genitive?

• davalac krvi = donor of blood

Why accusative?

• ima težinu = has weight
  The thing being had is the direct object, so it goes into the accusative.

This is a very useful contrast to notice:

• genitive often shows relationship, possession, type, or of
• accusative often marks the direct object

So this sentence contains two different case patterns at once.