Medical Dictionaries

Medical Dictionary for Regulatory Activities – MedDRA and World Health Organization Drug Dictionary – WHODD

What is NOS in MedDRA Preferred Terms? Why do they use it?

What is NOS in MedDRA Preferred Terms? Why do they use it?

Example:

Abdominal hernia NOS
Abdominal hernia NOS gangrenous
Abdominal hernia NOS, obstructive

Blood alkaline phosphatase NOS
Blood alkaline phosphatase NOS abnormal
Blood alkaline phosphatase NOS decreased
Blood alkaline phosphatase NOS increased
Blood alkaline phosphatase NOS normal

Why do they do it?