【Objective】 To analyze the difference of the internal control (IC) Ct value of two sets of blood nucleic acid detection(NAT) systems for individual donation and explore the feasibility of the IC Ct value used as stability evaluation index of NAT system. 【Methods】 A total of 4342 blood samples were randomly selected from our center from June to November 2020, and the IC Ct values of NAT system were classified into three categories: 1) classified by detection items: HBV, HCV and HIV; 2) classified by sample type: negative control (NC), positive control (PC), internal quality control (QC), blood donor sample (S); 3) classified by different instruments: system A and system B, and the differences of IC Ct value were analyzed and compared. 【Results】 A total of 14 196 IC Ct values of NAT were collected, showing a non-normal distribution. 1) classified by detection items: there were differences in the median of overall IC Ct values of HBV, HCV and HIV (H=859.6, P<0.01), which were 29.59 (29.09, 30.17), 29.82 (29.32, 30.06) and 30.16 (29.55, 30.78), respectively; 2) classified by sample type: there were differences in median of overall IC Ct values of NC, PC, QC and S (H=1 158, P<0.01), which were 28.91 (28.29, 29.42), 31.49 (30.45, 32.30), 29.13 (28.59, 29.70) and 29.88 (29.33, 30.44), respectively; 3) There was no statistical significance for the IC results of the same detection items (sample type) in the two NAT systems (P>0.05), except for HBV QC (Z=1 635)and S (Z=1 848 560), HCV S (Z=1 957 844), HIV S (Z= 2 217 855) (P<0.01). No difference in IC values (P<0.01) was noted for any detection items (NC, PC, QC and S) in the same set of detection system. 【Conclusion】 Although IC values trended to be different due to types of sample, the NC, PC, and QC samples that come with the original reagents were identical in the two detection systems. The change of IC Ct value may be used as an evaluation index for the stability of the detection system.

Objective To observe the value of ultrasound-guided intra-articular injection of hypertonic glucose(HG)for treating knee osteoarthritis in plateau area.Methods Ninety-one patients with knee osteoarthritis in plateau area(124 affected knee joints)were enrolled.The knee joints were divided into 20％HG group(n=67),25％HG group(n=42)or sodium hyaluronate group(n=15)based on the medication.Clinical and ultrasound scores were compared before and after treatment,and the efficacy of injection of HG was evaluated.Results At the 12th and 48th weeks after treatment,visual analog scale(VAS)scores decreased in all 3 groups(all P＜0.05),and Lysholm scores of 20％HG group and 25％HG group increased compared to those before treatment(all P＜0.05).The difference of Lysholm score before and in the 12th week after treatment,and of VAS score before and in the 48th week after treatment of 25％HG group were higher than those of 20％HG group(both P＜0.05).The joint exudation score of 20％HG group decreased in the 48th week after treatment compared to that before treatment(P＜0.05),and the synovial blood flow score decreased in the 12th and 48th weeks after treatment compared to those before treatment(both P＜0.05).The joint exudation score of 25％HG group decreased in the 48th week after treatment compared to that before treatment(P＜0.05),and the synovial hyperplasia and synovial blood flow score decreased in the 12th and 48th weeks after treatment compared to before treatment(all P＜0.05).The joint exudation score of sodium hyaluronate group decreased in the 48th week after treatment compared to that before treatment(P＜0.05),and the synovial hyperplasia score decreased in the 12th and 48th weeks after treatment compared to that before treatment(both P＜0.05).Conclusion Ultrasound-guided intra-articular injection of HG,esp.25％HG,had certain value for treating knee osteoarthritis in plateau area.