Objective To obtain the information on the frequency of diagnostic X-ray examinations in Guangdong province in order to provide reference data for the rational application of diagnostic radiology.Methods A typical stratified sampling method was used to select 56 medical institutions in 7 districts in Guangdong province for the survey of the frequencies of diagnostic X-ray examinations.Multiple linear regression analysis was performed using the relevant variables of the surveyed sample (total number of hospitals,number of outpatients,number of inpatients,number of radiation workers,and number of diagnostic equipment).The dependent independent variables were fitted to the linear regression equation to estimate the frequency of routine diagnostic X-ray examinations and diagnostic CT examinations and the total frequency of diagnostic medical X-ray examinations in Guangdong province in 2016.Results By the largest percentage contribution,chest radiography accounted for 60.84％ of the routine diagnostic X-ray examinations,brain scans 28.03％ of diagnostic CT examinations,and cardiovascular interventions 48.83％ of interventional radiology.For the group of above 40 years old,the largest percentage contributions were,respectively,routine diagnostic X-ray examination 47.95％,diagnostic CT examinations 65.41％,and interventional radiology 75.64％.All types of medical X-ray examinations are concentrated in the tertiary and secondary hospitals.Based on this survey,the examination frequencies for 2016 in Guangdong were estimated to be,respectively,diagnostic X-ray examination 699 examinations per 1 000 population and CT diagnostic 231 examinations per 1 000 population,with the total of 992 examinations per 1 000 population.Conclusions This survey was completed to a limited degree and less investment.The results showed that the diagnostic radiology in Guangdong province is developing with increased frequencies,with wide varieties of X-ray examination types in the tertiary and secondary hospitals.Relevant competent defpartments should pay attention to strengthening the radiation protection of examined individuals and actively providing guidance on the correct and rational applicc ation of diagnostic radiology so as to achieve profit and avoid disadvantages.

【Objective】 To analyze the correlation between platelet distribution width (PDW) and hyperuricemia (HUA). 【Methods】 For this study we recruited 4 885 teaching and administrative staff of Xi’an Jiaotong University who took the physical examination in 2020 and met the requirements. The basic information, blood routine and serum biochemical index results were collected and analyzed retrospectively. Data were sorted by gender, and the serum UA level and the prevalence of HUA in different PDW quartiles were compared after dividing PDW into quartiles. The association of PDW with other indexes including age, serum biochemical indexes and blood routine indexes was analyzed. Then, the factors related to HUA in different genders were analyzed, and the independent influence of PDW on HUA was further analyzed. 【Results】 The serum UA level and prevalence of HUA were on the increase among different PDW quartiles both in two genders, and PDW level was positively correlated with serum UA level (P<0.05). In addition, PDW was correlated with age, fasting blood glucose, indicators related to liver and kidney function, and certain indexes of blood lipid and blood routine tests. Among the above indicators, glutamic-pyruvic transaminase, glutamic oxalacetic transaminase, creatinine, urea, white blood cell count, hematocrit, and blood lipid were all significantly associated with HUA in both genders (P<0.05). In addition, HUA significantly associated with platelet count in males (P<0.05), but with age, fasting blood glucose, hemoglobin, red blood cell distribution width, and PDW in females (P<0.05). After excluding the above confounding factors, the risk of HUA in males with high levels of PDW was still significantly increased (P<0.05), but there was no significant difference in females (P>0.05). 【Conclusion】 PDW is correlated with HUA, and PDW may be an independent risk factor for HUA in males. However, further study is needed.