The Psoas major muscle (PMM) is a long, thick, fusiform muscle and one of the muscular components of the posterior abdominal wall. The aim of this study was to assess the psoas major muscle thickness in apparently healthy adults in Port Harcourt metropolis. Two hundred and ten (210) apparently healthy volunteers aged 18 years and above were recruited. A high frequency (7.5 MHz) linear transducer of a 4D LOGIQ P6 General Electrics Ultrasound machine was used to measure the muscle at the point of maximum thickness. Data was analysed using SPSS version 21.0. Pearson correlation analysis was used to test for the correlation between PMM thickness and Age, Body Mass Index, Height and Weight.. Statistical test was considered significant at p ≤ 0.05 at 95% confidence interval. The mean PMMT was 34.28±5.15mm and correlated with age (r= 0.304, P<0.05), height (r=0.234, p=0.001), weight (r=0.535, p=0.000) and BMI (r=0.443, p=0.000). The PMMT was greater in males with a mean difference of 3.08mm. A mean difference of 6.42mm existed between the professionals and clerical support staff. There is significant difference in mean PMMT between the Igbos and Hausas. Psoas major muscle thickness varies significantly with occupation, ethnicity, age, gender and anthropometric variables.\n Keywords: Sonography, Evaluation, Apparently, Healthy, Psoas muscle, Thickness

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