[Analysis of the predictive value of plateletcrit for the degree of liver fibrosis in patients with chronic HBV infection with ALT less than two times the upper limit of normal].

Objective: Plateletcrit (PCT) is considered a new potential index to predict the degree of liver fibrosis in patients with chronic hepatitis B (CHB). This study aimed to explore the predictive value of PCT for the degree of liver fibrosis in patients with chronic hepatitis B virus (HBV) infection with alanine aminotransferase (ALT) < 2× upper limit of normal (ULN). Measurement data were compared using the t-test, ANOVA, or non-parametric test (Mann-Whitney U test). Categorical variables were compared using χ (2) test or Fisher's exact test. Methods: 140 cases with chronic HBV infection who underwent liver biopsy and ALT < 2×ULN were enrolled from January 2016 to March 2021. Univariate and multivariate logistic regression and the area under the receiver operating characteristic curve (AUC) were used to determine the predictive value of PCT for the degree of liver fibrosis. The likelihood ratio (LR) was used to optimize the selection of the diagnostic cut-off. Results: (1) Among the 140 cases, there were 34 (24.3%) cases in the S0 stage, 47 (33.6%) cases in the S1 stage, 16 (11.4%) cases in the S2 stage, 19 (13.6%) cases in the S3 stage, and 24 (17.1%) cases in the S4 stage. The overall mean PCT level was 0.19 ± 0.06%. (2) Univariate analysis revealed that PCT between patients with stages of liver fibrosis was S(0-1) and S(2-4) (0.20% ± 0.05% vs. 0.16% ± 0.06%, t = 3.955, P < 0.001), S(0 -2) and S(3-4) (0.20% ± 0.05% vs. 0.15% ± 0.06%, t = 5.631, P < 0.001) and S(0-3) and S4 (0.20% ± 0.05% vs. 0.12% ± 0.05%, t = 7.113, P < 0.001), respectively, and the differences were statistically significant. Multivariate logistic regression analysis showed that PCT was an independent risk factor for liver fibrosis stages S(2-4), S(3-4), and S4 (OR = 0.925, 95% CI: 0.859 - 0.997, P = 0.042; OR = 0.867, 95% CI: 0.789 - 0.954, P = 0.003; OR = 0.708, 95% CI: 0.593 - 0.846; P < 0.001). (3) The AUCs of PCT were 0.702, 0.777, and 0.885 for diagnosing liver fibrosis stages S(2-4), S(3-4), and S4 in patients with chronic HBV infection with ALT < 2×ULN. PCT was superior for the cirrhosis (S4) diagnosis. 92 (65.7%) cases were diagnosed as cirrhosis or non-cirrhosis according to the LR optimized diagnostic and exclusion diagnostic cut-offs (≤0.09%, ≤0.17%), with an accuracy of 97.8%. Conclusion: PCT has a high diagnostic and exclusion value for cirrhotic patients with chronic HBV infection with ALT < 2×ULN. Furthermore, it can be used as a non-invasive diagnostic index for determining and assisting the diagnosis of cirrhosis in resource-constrained areas, reducing the need for pathological examination of liver biopsies, and it has the advantage of being simple and intuitive without complex calculations.