Hi,

140/90 is your limit on your BP getting too high. Top number going above 140 or bottom number going above 90 is too high.

As for low, im not sure but at 25 wks i had BP of 65/40 and my OB got really worried. He said he hasnt seen BP that low on someone he wasnt operating on before and i was sitting right in front of him. I was extremely sick with the flu and badly dehydrated thats why it was so low. He admitted me to hospital right then and there.