Which pregnancy category is considered the riskiest?

A pregnancy is called high-risk pregnancy if there are such complications that could affect the health of a pregnant woman, her baby, or both.

High-Risk Pregnancy Categories:
A single potential complication can turn a healthy pregnancy into a high-risk pregnancy, read below to know major types of high-risk pregnancy:

1. Late pregnancy: Because genetic defects generally start increasing after the age of 40 in a woman, so pregnancies of women in their late thirties or after 40 is considered a high-risk pregnancy.

2. Pregnancy with medical history of mother:  if mother-to-be has such medical conditions as diabetes, high blood pressure or low blood pressure, anemia, heart problem, or/and problems in their kidney(s) or/and lungs or any chronic infections like HIV etc  it would be considered a high-risk pregnancy.

3. Medical problems occurring pregnancy:
Sometimes a healthy pregnant woman develop some medical problems during pregnancy like Preeclampsia(a syndrome that includes high blood pressure, protein in urine and swelling in body) and Gestational diabetes (a type of diabetes that develops during pregnancy). Pregnancies with these medical conditions are referred high-risk pregnancies. 

High-risk pregnancies require special care and well management by a specialist doctor or expert of the field to help ensure the best outcome for the mother and baby.