How are synovial fluid analysis results from knee arthrocentesis interpreted?

Updated: Nov 03, 2020
  • Author: Gil Z Shlamovitz, MD, FACEP; Chief Editor: Erik D Schraga, MD  more...
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Answer

The aspirated synovial fluid is then analyzed (see Table 1 below). [7, 8]

Table 1. Characteristics of Synovial Fluid on Analysis (Open Table in a new window)

 

Appearance

WBCs, cells/µL

PMN cells

Glucose concentration, mg/dL

Protein concentration, g/dL

Normal

Clear

<150

<0.25

Serum glucose

1.3-1.8

Noninflammatory

Clear

<3000

<0.25

Serum glucose

2-3.5

Inflammatory

Cloudy

>3000

<0.75

<25

>4

Purulent

Cloudy

>50,000

>0.9

<25

>4

Hemorrhagic

Bloody

>2000

~0.3

Serum glucose

PMN = polymorphonuclear; WBC = white blood cell.


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