|Classification and external resources|
|ICD-10||O20, O46, O67, O72|
Obstetrical hemorrhage refers to heavy bleeding during pregnancy, labor, or the puerperium. Bleeding may be vaginal and external, or, less commonly but more dangerously, internal, into the abdominal cavity. Typically bleeding is related to the pregnancy itself, but some forms of bleeding are caused by other events. Obstetrical hemorrhage is a major cause of maternal mortality.
Early pregnancy bleeding
First trimester bleeding, is obstetrical hemorrhage in the first trimester (0 weeks-12 weeks of gestational age). First trimester bleeding is a common occurrence and estimated to occur in approximately 25% of all (clinically recognized) pregnancies.
- Abortion (spontaneous), that is, miscarriage. One study came to the result that the risk of miscarriage during the course of the pregnancy with just spotting during the first trimester was 9%, and with light bleeding 12%, compared to 12% in pregnancies without any first trimester bleeding. However, heavy first trimester bleeding was estimated to have a miscarriage risk of 24%.
- Gestational trophoblastic neoplasia
- Ectopic pregnancy, which implies a pregnancy outside the uterus, commonly in the tube, and may lead to bleeding, internally, that could be fatal if untreated. In cases where there is a heavy bleeding and an obstetric ultrasonography comes to the result of pregnancy of unknown location (no visible intrauterine pregnancy), is has been estimated that approximately 6% have an underlying ectopic pregnancy.
- Implantation bleeding
- Chorionic hematoma
- Lower GU tract causes
Antepartum bleeding (APH), also prepartum hemorrhage, is bleeding during pregnancy from the  24th week (sometimes defined as from the 20th week) gestational age to term. The primary consideration is the presence of a placenta previa that is a low lying placenta, a condition that usually needs to be resolved by delivering the baby via cesarean section. Also a placental abruption (in which there is premature separation of the placenta) can lead to obstetrical hemorrhage, some times concealed.
Bleeding during labor
Besides placenta previa and placental abruption, uterine rupture can occur as a very serious condition leading to internal or external bleeding. Bleeding from the fetus is rare, usually not heavy, but always very serious for the baby. This condition is called as Vasa Previa. Occasionally this condition can be diagnosed by ultrasound. There are also tests to differentiate maternal blood from fetal blood which can help in determining the source of the bleed.
Bleeding after delivery, or postpartum bleeding, is the loss of greater than 500 ml of blood following vaginal delivery, or 1000 ml of blood following cesarean section. Other definitions of post partum bleeding are haemodynamic instability, drop of haemoglobin of more than 1 g % or requiring blood transfusion.
- page 436 in: 2013 ICD-10-CM Draft Edition, by Carol J. Buck, Elsevier Health Sciences, 2013. ISBN 9781455774883.
- 2014 ICD-10-CM Diagnosis Code O20.9 from 2014 ICD-10-CM/PCS Medical Coding Reference].
- Pregnancy, Bleeding. eMedicineHealth. URL: http://www.emedicinehealth.com/pregnancy_bleeding/article_em.htm. Accessed on: April 12, 2009.
- Elective Abortion at eMedicine
- Hasan, R.; Baird, D. D.; Herring, A. H.; Olshan, A. F.; Jonsson Funk, M. L.; Hartmann, K. E. (2009). "Association Between First-Trimester Vaginal Bleeding and Miscarriage". Obstetrics & Gynecology 114 (4): 860. doi:10.1097/AOG.0b013e3181b79796.
- Kirk, E.; Bottomley, C.; Bourne, T. (2013). "Diagnosing ectopic pregnancy and current concepts in the management of pregnancy of unknown location". Human Reproduction Update 20 (2): 250–61. doi:10.1093/humupd/dmt047. PMID 24101604.
- patient.co.uk » PatientPlus » Antepartum Haemorrhage Last Updated: 5 May 2009
- The Royal Women’s Hospital > antepartum haemorrhage Retrieved on Jan 13, 2009
- Placenta praevia, placenta praevia accreta and vasa praevia: diagnosis and management (PDF). Royal College of Obstetricians and Gynaecologists. January 2011. Retrieved June 25, 2015.[page needed]