Abstract: Objective To investigate the value of CT measurement of abdominal fat and skeletal muscle in the nutritional assessment of patients with gastric cancer. 
Methods Fifty-six patients with gastric cancer were consecutively collected, and clinical nutritional assessment indexes, nutritional risk screening 2002 (NRS2002) scores and patient-generated subjective global assessment (PG-SGA) scores were recorded. Visceral fat volume (VFV) and subcutaneous fat volume (SFV) of the umbilical plane and whole abdomen were measured, respectively. Then visceral-to-subcutaneous fat volume ratio (VSR) and visceral fat percentage (VF%) were calculated. Skeletal muscle volume (SMV) of the third lumbar transverse plane and the third lumbar vertebra plane were measured, and skeletal muscle index (SMI) was calculated. The correlations of CT measurements with clinical nutrition scores and clinical quantitative indexes were analyzed. 
Results The single CT measurement results of abdominal fat and skeletal muscle had no correlation with NRS2002 and PG-SGA scores, while 2D and 3D measurements of VFV and SFV showed positive correlations (r=0.906, 0.921, P＜0.001). VFV and SFV were positively correlated with BMI (P＜0.001). SMI, 2D and 3D SMV were positively correlated with right upper arm muscle circumference and grip strength (P＜0.001). 
Conclusion CT measurement indexes of abdominal fat and skeletal muscle are correlated with quantitative indexes of clinical nutritional assessment, which have certain value for nutritional assessment of gastric cancer patients.

Key words: stomach neoplasms, fat measurement, skeletal muscle measurement