Kleihauer-Betke (KB) Test. The KB test is performed to quantitate the number of fetal cells present in the maternal circulation. Once the size of the feto-maternal. Hemoglobin F quantitation by flow cytometry has been found to be simple, reliable, and more precise than the Kleihauer-Betke test,87 In the CAP. The Kleihauer-Betke test is a somewhat crude laboratory method used to screen maternal blood samples for the presence of fetal red blood cells.

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RBC count Hematocrit Hemoglobin. The information gained is important because recurrence risks may be less than for unexplained stillbirth.

Interfering Factors In the case of maternal persistence of fetal hemoglobin or other maternal hemoglobinopathies that result in elevated HbF, the KB test will be falsely positive and flow cytometry must be used to quantitate the amount of fetal hemorrhage in maternal circulation. Of 30, trauma patients admitted, were pregnant, and 93 of these underwent electronic fetal monitoring.

A standard blood smear is prepared from the mother’s blood and exposed to an acid bath.

Kleihauer–Betke test

Artificial rupture of membranes Episiotomy Symphysiotomy Forceps in childbirth Ventouse in childbirth Kliehauer device. From Wikipedia, the free encyclopedia. Delivery does result in higher frequency of detection of micro-hemorrhages but this should not confound interpretation of FMH as a possible cause of stillbirth.


Reasoning that the magnitude of TPH would reflect uterine injury, we evaluated Kleihauer-Betke testing as an independent predictor of preterm labor PTL after maternal trauma. National Center for Jleihauer InformationU. It is not necessary to draw the sample before induction, onset of labor, delivery, placental delivery etc. This disruption in the placental barrier may occur for many reasons, including intra-uterine fetal demise and trauma.

General description A peripheral blood smear is made from the maternal postpartum sample and treated with acid. In maternal trauma, the Kleihauer-Betke KB test has traditionally been used to detect transplacental hemorrhage TPHso that Kpeihauer women could receive appropriate Rh immune prophylaxis.

Nuchal scan Anomaly scan. Turn recording back on. Because tesf is an independent risk factor, many authors recommended routine use in the setting of trauma, regardless of Rh status and regardless of the mechanism or force of the trauma. McRoberts maneuver Woods’ screw maneuver Zavanelli maneuver.

Kleihauer-Betke (KB) Test – , Laboratory Continuing Education

Clear Turn Off Turn On. Clinical assessment does not. Enzyme treated indicator cells teet added, only binding to the fetal cells that were present and sensitized, resulting in a process called erythrocyte rosetting, or E-rosetting.


Simple comparative counts allow an estimate of whether a significant fetal-maternal transfusion occurred. With a negative KB test, posttrauma electronic fetal monitoring duration may be limited safely.

Mean corpuscular tesg Mean corpuscular hemoglobin concentration Mean corpuscular volume Red blood cell distribution width. It takes only 0. Calculation of the percentage of fetal vs. The process exposes maternal blood smear to an acid solution. This removes adult hemoglobinbut not fetal hemoglobin, from the red blood cells.

Apt—Downey test Kleihauer—Betke test. This article needs additional citations for verification. This could be caused by a process in the mother which causes persistent elevation of fetal hemoglobin, e. There is some controversy on KB testing in the setting of trauma in pregnancy. PMC ] [ PubMed: Cortey A, Brossard Y. Kleihauuer from ” https: