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Table 2 Anterior Chamber Tap Sensitivity, Specificity and Predictive Values. The table describes the sensitivity, specificity, predictive values and accuracy of the anterior chamber tap to correctly identify the same pathogen as the vitreous tap. The overall results show that anterior chamber tap has medium to low sensitivity and specificity. However, the subgroup analysis showed that in cases of post-surgical endophthalmitis, the anterior chamber tap has high specificity and high positive predictive value

From: Sensitivity, specificity and predictive values of anterior chamber tap in cases of bacterial endophthalmitis

Type of Endophthalmitis SNaq (%) SPaq (%) Prevalence (%) PPVaq (%) NPVaq (%) ACCaq (%)
Post-Surgical 36.73 92.31a 66.21 94.74a 27.91 48.38
Post-Traumatic 30.77 69.23 61.9 66.60 33.3 43.59
Associated to Corneal Ulcers 62.5 33.3 61.53 62.5 33.3 52.0
Endogenous 44.4 100 69.13 100 28.57 54.54
Due to Intravitreal Injections 20.0 91.67 62.5 80.0 40.74 46.87
Overall 38.21 75.51 64.73 79.66 32.74 48.83
  1. Late onset endophthalmitis due to glaucoma procedures were not included because of the low sample size that prevented statistical analysis
  2. Abbreviations: SPaq = aqueous sample specificity, PPVaq = positive predictive value of the aqueous sample, NPVaq = negative predictive value of the aqueous sample, ACCaq = aqueous ample accuracy
  3. a statistically significant data (p < 0.05)