The feasibility and cost-effectiveness of screening women for congenital thrombophilic alterations before oral contraceptive (OC) treatment was investigated. A total of 525 women (mean age 21.9 years, 73% aged < 25 years) were examined before their first OC course. At first screening, completely normal results were recorded in 485 (92.4%) women, the remaining showing single (n = 34) or multiple (n = 6) alterations. At second examination (possible in 37 of 40), activated protein C resistance (APCR) was confirmed in 21 cases (4.0%, 18 with factor V Leiden), protein C, or protein S reduction in 8 (1.5%) and 2 (0.4%) cases, respectively. No cases with antithrombin III deficiency were detected. The global estimated cost ($US) to detect one altered case was: $7795 for protein S, $2696 for antithrombin III (no case found), $1374 for protein C and $433 for APCR. The present study confirms that extensive thrombophilic screening before OC treatment is not currently advisable. APCR assessment, however, seems to have a favorable cost-effectiveness ratio: the alteration is frequent and has a synergistic effect with OC; sensibility and specificity of some methods are good; family history is unreliable to single out possible carriers; finally, carriers can be fully informed of their increased thrombotic risk if treated with OC and can receive thromboprophylaxis during life situations associated with high thrombotic risk (e.g., pregnancy and puerperium).
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