Final answer:
The abbreviation 'CF' is used to document patients with mucus build-up in conditions like Cystic Fibrosis.
Explanation:
CF is the abbreviation most likely used to document a patient experiencing a build-up of mucus in their body, referring to Cystic Fibrosis, a condition where thick mucus accumulates in the lungs and digestive system.
Learn more about Cystic Fibrosis here:
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