Table 3.

Predictive values of Pj PCR and betaglucan in serum at a pre-test probability of 20%

Index tests in serum	Positive predictive value	Negative predictive value
Pj PCR positive	0.46	1.0
Pj PCR with Ct ≤34a	0.71	0.99
BG ≥80 pg/mlb	0.45	0.99
BG ≥200 pg/mlb	0.63	0.98
BG ≥400 pg/mlb	0.69	0.97
Pj PCR positive and BG ≥200 pg/mlb	0.70	0.98

Pj Pneumocystis jirovecii, PCP Pneumocystis jirovecii pneumonia, BG 1,3-ß-D-glucan

The results are based on 26 patients with PCP and 21 HIV-infected negative controls

^aThree PCP patients whose serum samples had been analysed after 1:2 dilution were excluded

^bOne PCP patient whose serum sample was not analyzed for BG due to insufficient volume of serum was excluded