die Blutprobe
blood sample
A small amount of blood taken from a living being for a medical examination, test, or analysis.
Für die Diagnose der Krankheit war eine Blutprobe erforderlich.
A blood sample was required for diagnosing the disease.

blood sample
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blood sample
A small amount of blood taken from a living being for a medical examination, test, or analysis.
Für die Diagnose der Krankheit war eine Blutprobe erforderlich.
A blood sample was required for diagnosing the disease.

The word is a simple compound of "Blut" (blood) and "Probe" (sample). Here, a "Probe" is a small amount of something taken for examination, so a "Muster" or "sample."
Die Ergebnisse der Blutprobe kommen in ein paar Tagen.
The results of the blood sample will come in a few days.
Pay attention to the perspective: the doctor "entnimmt" (takes) or "nimmt" (takes) a blood sample. The patient "gibt eine Blutprobe ab" (provides/gives a blood sample).
Die Ärztin hat mir heute Morgen eine Blutprobe entnommen.
The doctor took a blood sample from me this morning.
To state the purpose of the blood sample, you often use the preposition "für" (for) with the accusative or "zur" (zu der) (for the purpose of) with the dative. "Zur" is used before nouns.
Die Blutprobe ist für einen allgemeinen Gesundheitscheck.
The blood sample is for a general health check-up.
rehearsal / sample / test
'die Probe' and 'die Blutprobe' can both mean a small amount used for a test or examination. 'Probe' is general and can consist of many substances, for example water, soil, saliva, or blood. 'Blutprobe' is more specific and always means a small amount of blood that is medically examined. The words can be confused because a blood sample is also a sample. If it should be clear that blood is involved, 'Blutprobe' is more precise; if the material is not important or is already known, 'Probe' is often enough.

Nach der Untersuchung hat Marie eine Blutprobe abgegeben.
After the examination, Marie gave a blood sample.
Die Probe aus dem Brunnen wird heute auf Keime untersucht.
The sample from the well is being tested for germs today.