Template:Arthrocentesis diagnostic chart: Difference between revisions
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===[[Special:MyLanguage/Arthrocentesis|Arthrocentesis]] of synoval fluid=== | ===[[Special:MyLanguage/Arthrocentesis|Arthrocentesis]] of synoval fluid=== <!--T:1--> | ||
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{| class="wikitable" | {| class="wikitable" | ||
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>'''1,100 (prosthetic joint)''' | >'''1,100 (prosthetic joint)''' | ||
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>25,000; LR=2.9 | >25,000; LR=2.9 | ||
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>50,000; LR=7.7 | >50,000; LR=7.7 | ||
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>100,000; LR=28 | >100,000; LR=28 | ||
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|- | |- | ||
| PMN | | PMN | ||
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>64% (prosthetic joint) | >64% (prosthetic joint) | ||
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>90% | >90% | ||
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|- | |- | ||
| Culture | | Culture | ||
Latest revision as of 17:23, 24 January 2026
Arthrocentesis of synoval fluid
| Synovium | Normal | Noninflammatory | Inflammatory | 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[1]
- ↑ 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.