How to differentiate between Placenta abruption and Placenta previa?

Placental abruption is characterized by sudden onset of symptoms like visible or concealed bleeding, excessive blood loss with a higher degree of shock or anemia, the degree of pain is intense, does not subside, occurs in between contractions and is acute with a firm uterine tone.

Placenta previa is characterized by painless and externally visible bleeding, excessive loss of blood with no greater intensity of shock or anemia, pain is often unrelative with the uterus being non-rigid and relaxed.

Pain is one of this biggest differentiating factors between the 2 conditions

Question: Maternal shock following excessive bleeding is observed in the placenta previa.True/False

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