Background of the study: About one-third of all diabetics may go undetected since problems are typically not discovered until after they have developed. No randomized trials are demonstrating the advantages of early diagnosis through screening of asymptomatic individuals, even though the burden of diabetes is well known, the natural history is well understood, and there is good evidence for the benefit of treating cases diagnosed through usual clinical care. However, there is enough indirect evidence to support the opportunistic screening of high-risk patients in a clinical environment.

Objectives: To assess the effectiveness of planned teaching about knowledge regarding gestational diabetes among antenatal mothers in the selected hospital. A pre-experimental and quantitative research approach was used with one group pre and post-test design to evaluate the effectiveness of planned teaching. The tool used for data collection was a structured questionnaire which comprised 10 items in demographic data and 35 item on gestational diabetes the reliability of tool was established by split half method.

Results: The major finding of the study result showed that among all subjects, in pre- test score was, 0-20% of the antenatal mothers had poor level of knowledge score and 41-60% had good level of knowledge score. Post-test knowledge score was 61-80%of the antenatal mothers had very good level of knowledge score, 81-100% had Excellent level of knowledge score. Mean Pre-test knowledge score of the subjects was 13.40±3.26. And Mean Post-test Knowledge score of the subjects was 25.86+1.95