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Stool fat differential measurement, quantitative

Analysis of substance using immunoassay technique, single step method

PSA (prostate specific antigen) measurement, complexed

Sodium level

Removal of tissue from sphenoid sinus using an endoscope

Incision of sphenoid nasal sinus using an endoscope

Removal of sphenoid nasal sinus tissue using an endoscope

Change of breathing tube in windpipe

Diagnostic exam of voice box using an endoscope

Diagnostic exam of voice box using an endoscope with operating microscope or telescope