D. KangwanpongS. AjjimakornM. JirapinyoMahidol University2018-06-142018-06-141990-02-01Journal of the Medical Association of Thailand. Vol.73 Suppl 1, (1990), 73-76012522082-s2.0-0025381484https://repository.li.mahidol.ac.th/handle/20.500.14594/16082The direct chromosome preparation from the CV is a reliable method for diagnosis of the gross chromosomal anomalies and could be completed in the shortest possible time. However, direct villi preparation does not always provide sufficient or good quality metaphases. The culture medium plays an important role in achieving a good success rate. We report the efficacy of our modified medium and compared it with Chang's. The modified medium showed slightly higher successful karyotyping (68.4%) than the Chang medium (65.4%). This success rate showed no statistically significant difference. The success rate enhanced up to 92.3 per cent using our modified medium when the CV was of good quality. The higher amount of CV did not lead to a higher success rate. Any amount more than 5 mg of the CV was sufficient for direct chromosome preparation.Mahidol UniversityMedicineArticleSCOPUS