Eligibility criteria to use IUCDs according to WHO

Category 1: No restriction on use Category 2: Advantages overweigh risks
Category 3: Risks overweigh advantages
Category 4: Do not use.

Category 1:
Women coming into this category are not having any restriction in usage of IUCD's .
These are women with age >20 yrs, parous ladies, obese ladies, with history of headaches, with cardiovascular complications, with chronic diseases – thyroid, epilepsy, DM(diabetes mellitus), jaundice, hepatitis, malaria, non pelvic TB, cirrhosis etc.
Women with Gynaecological/Obstetrical conditions like – breast feeding women, women delivered 4wks back, with benign breast disease, CIN(Cervical intraepithelial neoplasia), cervical ectropion, prior pelvic surgery etc all can use.

Category 2:
Women coming into this category can use IUCD's as advantages overweigh risks.
These are women with age < 20 yrs, with Gynaecological/Obstetrical conditions like nulliparity, menorrhagia/dysmenorrhea, endometriosis, past PID(pelvic inflammatory disease), fibroids, post partum < 48 hrs, post abortal. Also women chronic diseases like : thalassemias,  iron deficiency anemia, sickle cell disease.
Women with STD/HIV : (advice condom use) vaginitis without cervical pus/discharge.

Category 3:
Women coming into this category should use IUCD's with caution as risks overweigh advantages. Women in post partum period between 48 hrs to 4 wks, with benign gestational trophoblastic diseases, HIV positive or AIDS pts or women with increased risk of HIV / AIDS.

Category 4:
Women coming into this category should not use IUCD's.
These are women with pregnancy, puerperal and post abortal sepsis, active PID, malignant GTD's(gestational trophoblastic diseases), unexplained vaginal bleeding, cervical, ovarian and endometrial cancer.
 And also women with chronic diseases like : known pelvic TB, current STD or within 3 months.