Background and Objectives: Students with learning difficulties encounter poorer school outcomes and major problems in learning. Researchers investigated the factors in preschool stage that will help to diagnosis learning problems.
 Methods: A meta-analytic review provides means for assessing which factors show the strongest effects on long-term outcomes.
Results: This article presents a meta-analysis of main screening tests of learning disabilities examining 3 sources and 27 samples published from 2000 to 2017 in Iran. Fourteen screening tests were identified among 25 studies. The combined effect size for detection were 24.262 (CI: 19.111-29.412), respectively. Among them, the Kaufman's Neurological-Clinical Diagnostics Battery is the best alternative for preschoolers screening.
Conclusion: Implications for future research and practice are considered