When taking oral contraceptives, which complication should be ruled out?

When considering the complications associated with oral contraceptive use, deep vein thrombosis (DVT) is the primary concern. Oral contraceptives can increase the risk of thromboembolic events due to the hormones they contain, which can lead to blood clot formation. The estrogen component in many oral contraceptives is particularly associated with this increased risk, as it can affect the coagulation process.

While spontaneous abortion, pelvic inflammatory disease, and chlamydia infection are important to consider in the broader context of women's health, they are not direct complications attributable to the use of oral contraceptives. Spontaneous abortion is related to early pregnancy complications, pelvic inflammatory disease is an infection resulting typically from sexually transmitted infections or other microbial factors, and chlamydia is a sexually transmitted infection that, while it can cause significant reproductive health issues, does not directly arise from the use of oral contraceptives themselves.

Thus, when taking oral contraceptives, a thorough assessment for the risk of deep vein thrombosis is essential, making it the complication that should be routinely ruled out due to the hormonal influences on clotting mechanisms.