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===[[Special:MyLanguage/Arthrocentesis|Arthrocentesis]] of synoval fluid===

{| class="wikitable"
|-
| '''Synovium'''
| '''Normal'''
| '''Noninflammatory'''
| '''Inflammatory'''
| '''[[Special:MyLanguage/Septic Arthritis (General)|Septic]]'''
|-
| Clarity
| Transparent
| Transparent
| Cloudy
| Cloudy
|-
| Color
| Clear
| Yellow
| Yellow
| Yellow
|-
| WBC
| <200
| <200-2000
| 200-50,000
|
>'''1,100 (prosthetic joint)'''

>25,000; LR=2.9

>50,000; LR=7.7

>100,000; LR=28

|-
| PMN
| <25%
| <25%
| >50%
|
>64% (prosthetic joint)

>90%

|-
| Culture
| Neg
| Neg
| Neg
| >50% positive
|-
| Lactate
| <5.6 mmol/L
| <5.6 mmol/L
| <5.6 mmol/L
| >5.6 mmol/L
|-
| LDH
| <250
| <250
| <250
| >250
|-
| Crystals
| None
| None
| Multiple or none
| None
|}
*Viscosity of synovial fluid may actually be decreased in inflammatory or infectious etiologies, as hyaluronic acid concentrations decrease
*The presence of crystals does not rule out septic arthritis; however, the diagnosis is highly unlikely with synovial WBC < 50,000<ref>Shah K, Spear J, Nathanson LA, Mccauley J, Edlow JA. Does the presence of crystal arthritis rule out septic arthritis?. J Emerg Med. 2007;32(1):23-6.</ref>

Template:Arthrocentesis diagnostic chart/en - Revision history

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