What does it mean if a pregnancy test strip shows one dark line and one light line?

Generally, a pregnancy test strip showing one dark line and one faint line may be caused by diluted urine, early pregnancy, miscarriage, ectopic pregnancy, molar pregnancy, and other factors. If discomfort occurs, timely medical attention is recommended. Detailed explanations are as follows:

1. Diluted Urine

During a pregnancy test, if the urine is diluted—for example, after drinking large amounts of water immediately before the test—it may cause the test strip to display one dark and one faint line. It is recommended to perform the test using the first morning urine, as this contains the highest concentration of human chorionic gonadotropin (hCG).

2. Early Pregnancy

In early pregnancy, the hCG levels in the body gradually rise but may not yet have reached their peak, which could result in a pregnancy test showing one dark and one faint line. As the pregnancy progresses, the two lines on the test strip may become equally dark. Generally, no special treatment is required.

3. Miscarriage

After a natural or induced miscarriage, hCG levels in the body may not immediately return to non-pregnant levels, potentially causing the pregnancy test to show one dark and one faint line. This may also be accompanied by symptoms such as vaginal bleeding and abdominal pain. It is recommended to seek timely medical evaluation and follow appropriate treatment measures based on individual circumstances.

4. Ectopic Pregnancy

Ectopic pregnancy refers to the implantation of a fertilized egg outside the uterine cavity. Although hCG is still secreted, the levels are usually lower than those in a normal intrauterine pregnancy, potentially causing the pregnancy test to show one dark and one faint line. Symptoms may also include abdominal pain and vaginal bleeding. It is recommended to follow medical advice for treatment with medications such as methotrexate tablets, mifepristone tablets, or misoprostol tablets.

5. Molar Pregnancy

A molar pregnancy is a condition caused by abnormal development of the fertilized egg. This condition can cause elevated hCG levels, leading to a pregnancy test showing one dark and one faint line. It is often accompanied by symptoms such as abdominal swelling and coughing. It is recommended to visit a reputable hospital for treatment under a doctor's guidance, which may include preventive chemotherapy or vacuum aspiration curettage.

In daily diet, it is advisable to avoid consuming spicy or cold raw foods to prevent physical discomfort.