**3. Methodologies**

The study reviewed the results of the author's research in four steps as follows: **Step 1**: Using meta-analysis, we reviewed the risk factors for PPH during vaginal deliveries in 20 articles published in Thailand and around the world between 2005 and 2017.

**Step 2**: Reviewed the research results of the risk scoring system for the prediction of postpartum blood loss over 300 mL at Chiang Rai Regional Hospital, Thailand.

**Step 3**: Reviewed the research results of an appropriate risk score tool for the prediction of PPH at Sakon Nakhon Hospital, Thailand.

**Step 4**: During the years 2019–2020, the number of maternal deaths and PPHrelated hysterectomies at Chiang Rai Regional Hospital and Sakon Nakhon province were reported.

The research review was approved by the Ethics Committee for Human Research at Khon Kaen University, Thailand [HE 601234, HE 611093], the Chiang Rai Regional Hospital Ethics Committee on July 21st, 2017, and the Ethics committee of Sakon Nakhon Hospital (SKHREC 422562). Most of the research was based on secondary data. Those who volunteered had signed a consent form.

*Cases of Postpartum Hemorrhage and Hysterectomy in Thailand's Northern and Northeastern… DOI: http://dx.doi.org/10.5772/intechopen.102948*
