There is a need for instrument standardization to elicit a desired result in the subjects. The study assessed the psychometric properties of 2018 Mental health module questions in Ogun State Mandatory Continuous Professional Development Programme for Nurses. A cross-sectional study was used on the pre and post module results from the participants. Data analysis was done with SPSS window 17. The result showed an internal consistency of 0.249 and reliability coefficient of -0.1. The study concluded that there was inconsistency in the structure of the test items. The recommendation was made that experts in psychometric properties could be involved in the structure of the test items before its administration to nurses.