Vaginal bleeding occurs in 20 to 30% of confirmed pregnancies during the first 20 weeks of gestation; about half of these cases end in spontaneous abortion.
Vaginal bleeding is also associated with other adverse pregnancy outcomes such as the following:
Obstetric or nonobstetric disorders may cause vaginal bleeding during early pregnancy (see table Some Causes of Vaginal Bleeding During Early Pregnancy Some Causes of Vaginal Bleeding During Early Pregnancy ).
The most dangerous cause of vaginal bleeding during early pregnancy is
A ruptured corpus luteum cyst Functional cysts Benign ovarian masses include functional cysts and tumors; most are asymptomatic. Treatment varies depending on the patient's reproductive status. There are 2 types of functional cysts: Follicular... read more , although less common, is also possible and potentially dangerous and can cause hemoperitoneum and shock.
The most common cause is
Spontaneous abortion Spontaneous Abortion Spontaneous abortion is noninduced embryonic or fetal death or passage of products of conception before 20 weeks gestation. Threatened abortion is vaginal bleeding without cervical dilation... read more (threatened, inevitable, incomplete, complete, septic, missed)
A pregnant woman with vaginal bleeding must be evaluated promptly.
Ectopic pregnancy or other causes of copious vaginal bleeding (eg, inevitable abortion, ruptured hemorrhagic corpus luteum cyst) can lead to hemorrhagic shock. IV access should be established early during evaluation in case such complications occur.
History of present illness should include the following:
The patient’s gravidity (number of confirmed pregnancies), parity (number of deliveries after 20 weeks), and number of abortions (spontaneous or induced)
Description and amount of bleeding, including how many pads were soaked and whether clots or tissue were passed
Presence or absence of pain
If pain is present, onset, location, duration, and character should be determined.
Review of symptoms should note fever, chills, abdominal or pelvic pain, vaginal discharge, and neurologic symptoms such as dizziness, light-headedness, syncope, or near syncope.
Physical examination includes review of vital signs for fever and signs of hypovolemia (tachycardia, hypotension).
Evaluation focuses on abdominal and pelvic examinations. The abdomen is palpated for tenderness, peritoneal signs (rebound, rigidity, guarding), and uterine size. Fetal heart sounds should be checked with a Doppler ultrasound probe.
Pelvic examination includes inspection of external genitals, speculum examination, and bimanual examination. Blood or products of conception in the vaginal vault, if present, are removed; products of conception are sent to a laboratory for confirmation.
The cervix should be inspected for discharge, dilation, lesions, polyps, and tissue in the os. If the pregnancy is < 14 weeks, the cervical os may be gently probed (but no more than fingertip depth) using ringed forceps to determine the integrity of the internal cervical os. If the pregnancy is ≥ 14 weeks, the cervix should not be probed because the vascular placenta may tear, especially if it covers the internal os (placenta previa).
Bimanual examination should check for cervical motion tenderness, adnexal masses or tenderness, and uterine size.
The following findings are of particular concern:
Hemodynamic instability (hypotension, tachycardia, or both)
Orthostatic changes in pulse or blood pressure
Syncope or near-syncope
Peritoneal signs (rebound, rigidity, guarding)
Fever, chills, and mucopurulent vaginal discharge
Interpretation of findings
Clinical findings help suggest a cause but are rarely diagnostic (see table Some Causes of Vaginal Bleeding Some Causes of Vaginal Bleeding During Early Pregnancy ). However, a dilated cervix plus passage of fetal tissue and crampy abdominal pain strongly suggests spontaneous abortion, and septic abortion is usually apparent from the circumstances and signs of severe infection (fever, toxic appearance, purulent or bloody discharge). Even if these classic manifestations are not present, threatened or missed abortion is possible, and the most serious cause—ruptured ectopic pregnancy—must be excluded. Although the classic description of ectopic pregnancy includes severe pain, peritoneal signs, and a tender adnexal mass, ectopic pregnancy can manifest in many ways and should always be considered, even when bleeding appears scant and pain appears minimal.
A self-diagnosed pregnancy is verified with a urine test. For women with a documented pregnancy, several tests are done:
Quantitative beta-hCG level
Blood typing and Rh testing
Rh testing Prevention Erythroblastosis fetalis is hemolytic anemia in the fetus (or neonate, as erythroblastosis neonatorum) caused by transplacental transmission of maternal antibodies to fetal red blood cells.... read more is done to determine whether Rho(D) immune globulin is needed to prevent maternal sensitization. If bleeding is substantial, testing should also include complete blood count and either type and screen (for abnormal antibodies) or cross-matching. For major hemorrhage or shock, prothrombin time/partial thromboplastin time (PT/PTT) is also determined.
Transvaginal pelvic ultrasonography is done to confirm an intrauterine pregnancy unless products of conception have been obtained intact (indicating completed abortion). If patients are in shock or bleeding is substantial, ultrasonography should be done at the bedside.
The quantitative beta-hCG level helps interpret ultrasound results. Beta-hCG levels of ≥ 1000 to 2000 mIU/mL are commonly used as the discriminatory level; if the level is above the discriminatory level, a gestational sac may be visible if the pregnancy is intrauterine. However, intrauterine pregnancy is still possible even if it is not seen on transvaginal ultrasonography. No established beta-hCG level can exclude an intrauterine pregnancy. The discriminatory level at the facility where the test is done should be used to guide clinical management. ( 1 Diagnosis reference Vaginal bleeding occurs in 20 to 30% of confirmed pregnancies during the first 20 weeks of gestation; about half of these cases end in spontaneous abortion. Vaginal bleeding is also associated... read more ). In stable patients, serial ultrasonography can help guide management when beta-hCG levels are near this discriminatory level.
Ultrasonography can also help identify a ruptured corpus luteum cyst and gestational trophoblastic disease. It can show products of conception in the uterus, which are present in patients with incomplete, septic, or missed abortion.
If the patient is stable and clinical suspicion for ectopic pregnancy is low, serial beta-hCG levels may be done on an outpatient basis. Normally, the level doubles every 1.4 to 2.1 days up to 41 days gestation; in ectopic pregnancy (and in abortions), levels may be lower than expected by dates and usually do not double as rapidly. If clinical suspicion for ectopic pregnancy is moderate or high (eg, because of substantial blood loss, adnexal tenderness, or both), diagnostic uterine evacuation or dilation and curettage (D & C) or diagnostic laparoscopy should be considered.
Treatment of vaginal bleeding during early pregnancy is directed at the underlying disorder:
Unruptured ectopic pregnancy: Methotrexate or salpingotomy or salpingectomy via laparoscopy or laparotomy
Threatened abortion Treatment Spontaneous abortion is noninduced embryonic or fetal death or passage of products of conception before 20 weeks gestation. Threatened abortion is vaginal bleeding without cervical dilation... read more : Expectant management for hemodynamically stable patients
Inevitable, incomplete, or missed abortions: D & C or uterine evacuation
Septic abortion Treatment Septic abortion is serious uterine infection during or shortly before or after an abortion. Septic abortions usually result from induced abortions done by untrained practitioners using nonsterile... read more : IV antibiotics and urgent uterine evacuation if retained products of conception are identified during ultrasonography
Complete abortion: Obstetric follow-up
If patients have vaginal bleeding during early pregnancy, always be alert for ectopic pregnancy; symptoms can be mild or severe.
Spontaneous abortion is the most common cause of bleeding during early pregnancy.
Always do Rh testing for women who present with vaginal bleeding during early pregnancy to determine whether Rho(D) immune globulin is needed.