We will classify the gestantes in:

• Gestantes of high risk, subsidies of specializing attention.
• Gestantes of low risk, population reveille of the control in primary health care (AP).

The above mentioned stratification is realized in the first consultation, managing thus to diminish the maternal - fetal morbimortalidad. The gestante will be evaluated in each of the later control panel, in order to identify risk factors do not present up to this moment.

A simple method to stratify the risk is the test of Number, which he considers to be a pregnancy of that low risk in which the gestante remembers with clarity the date of the last rule and answers negatively the following questions with regard to:

• Medical, analytical, and structural problems of the mother:
  • Age 35-year-old 16-year-old or major minor.
  • Obesity with major IMC of 27.
  • Minor height of 1.45
  • Minor 45 kg weight.
• Pelvic anomalies
• Uterine malformations or previous uterine surgery
• Gestation with DIU
• Serious anemia minor Hb of 10 gr./dl
• Positive Serología luética
• Use of drugs
• Prostitution
• Gestante or sexual couple VIH bearer or sick with AIDS
• Other serious associate maternal pathologies: DM, HTA, renal insufficiency, epilepsy, cardiopatía, alcoholism, mental deficiency, serious psychiatric illness
• Low socioeconomic level or illiteracy
• Obstetric precedents:
• Pregnancy precedent ectópico
• Unfavorable obstetric precedents: distocias, deaths neonatales or fetal previous, premature babies, malformados, polihidramnios, one or more previous Cesarean sections, etc.)
• Precedent of low weight on having been born.
• Fetus precedent macrosómico 4.5 kg (major weight).
• Precedents of two or more miscarriages

This way, they can be established inside the gestantes, two clearly definite types of populations:

• The first one is constituted by the group of definite pregnant women of high obstetric risk (HOOP) for presenting precedents or alterations during the gestation that determine a clinical risk raised for the mother or the fetus.
• The second subpopulation there is the rest of the gestantes, considered of low obstetric risk.