What are the screening test for blood transfusion what are the most important conditions while blood transfusion is needed

Q.6. What are the screening test for blood transfusion what are the most important conditions while blood transfusion is needed.
Screening test for blood transfusion, screening test for blood transfusion  indentifies some disease such as
1. Hbs Ag for hepatitis B.
2. VDRL test for syphilis.
3. MP test for Malaria parasite
4. Dat-ELISA for kala azar.
5. HIV for aids.
6. Rh factor.

Important conditions of blood transfusion is needed.
1. Server PPH.
2. Server APH.
3. Ruptured uterus.
4. Ruptured entopic pregnancy.
5. Incomplete abortion with moderate to server anemia
6 . Major operative procedures e.g, Caesarean section.