Yale New Haven Hospital

Department of Laboratory Medicine
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Protein, body fluid

Lab Section: 



Lab Location: 

Main Lab

Test ID: 






On request


1 hour for STAT orders; 4 hours for Routine orders

Specimen Requirements: 

Collection: 1.0 mL Body Fluid in a Sterile Container.
Pediatric volume: 0.5 mL.


Reference Interval: 

See Below Table for Fluid Type specific ranges


Serum Ascites Albumin Gradient (SAAG) is a more useful measurement of portal hypertension
Patients that meet two out of the following three criteria are unlikely to have spontaneous bacterial peritonitis
Total Protein > 1 g/dL

Glucose < 50 mg/dL
LDH greater than the upper limit of normal for serum
The total protein concentration may help differentiate uncomplicated ascitesdue to cirrhosis from cardiac ascites, both of which have a SAAG ≥1.1 g/dL. In the case of cirrhosis, the total protein is <2.5 g/dL whereas in cardiac ascites it is ≥2.5 g/dL


Pleural fluid to serum total protein ratio ≤ 0.5 is consistent with a transudative process

CPT Code(s): 


Last Changed: 

7/2/2018 3:41 PM

Last Reviewed: 

7/2/2018 3:40 PM