Differential Diagnosis for Dark Brown Discharge at 6 Weeks Gestational Age
Single Most Likely Diagnosis
- Decidual bleeding: This is a common cause of vaginal bleeding or discharge in early pregnancy, especially around 6 weeks gestation. It occurs when the decidua (the lining of the uterus) separates from the embryo, leading to bleeding or discharge.
Other Likely Diagnoses
- Implantation bleeding: Although more common around 4-5 weeks gestation, implantation bleeding can sometimes present as dark brown discharge and may be considered if the timing of the last menstrual period is uncertain.
- Cervical polyp or cervical lesion: These can cause irregular vaginal bleeding or discharge, including dark brown discharge, especially if there is an associated infection or if the polyp is irritated.
- Infection (e.g., cervicitis, endometritis): Infections of the cervix or uterus can cause abnormal discharge, which may appear dark brown due to the presence of blood or inflammatory debris.
Do Not Miss Diagnoses
- Ectopic pregnancy: Although less likely, ectopic pregnancy is a critical diagnosis that must not be missed. It can present with vaginal bleeding or discharge, among other symptoms like abdominal pain.
- Molar pregnancy: A molar pregnancy can cause abnormal uterine bleeding, which might appear as dark brown discharge. It's crucial to diagnose this condition due to its potential complications.
- Threatened or inevitable abortion: These conditions can present with vaginal bleeding or discharge and are critical to diagnose to provide appropriate management and support.
Rare Diagnoses
- Cervical cancer: Although rare, cervical cancer can cause abnormal vaginal bleeding or discharge. It's essential to consider this diagnosis, especially if there are other risk factors or symptoms present.
- Uterine anomalies or abnormalities: Certain uterine anomalies can increase the risk of abnormal bleeding or discharge during pregnancy. These are rare but should be considered if other diagnoses are ruled out.