This is the 11010th most frequent Turkish word.
doktorundan
"From your doctor."
Here, 'doktorundan' signifies 'your doctor' (possessive noun) with the ablative case, used to express general satisfaction coming from the doctor's services or behavior.
Doktorundan memnunsan diğer hastalara da önerebilirsin.
If you are satisfied with your doctor, you can recommend them to other patients.
The word 'doktorundan' in this sentence functions as a possessive noun (your doctor) with the ablative case (-dan) indicating movement away or a source, used here to indicate the source of advice.
Doktorundan bir tavsiye alman gerekiyor.
You need to get advice from your doctor.
In this sentence, 'doktorundan' again represents 'your doctor' (possessive noun) with the ablative case implying where or from whom the action of receiving the news originated.