LOINC Code 75373-1: RBC.fetal/2000 RBC Kleihauer-Betke method (Bld)

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Erythrocytes.fetal/2000 erythrocytes. It is commonly used with the system or sample type Bld.

When is it used?

• Used in lab systems, EHRs, and clinical data exchange.
• May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
• Status: ACTIVE
• Order vs observation: Both
• Method: Kleihauer-Betke

What it does not mean

• The code identifies the observation or test, not the actual result.

Key facts

• Erythrocytes.fetal/2000 erythrocytes in Blood by Kleihauer-Betke method
• Erythrocytes.fetal/2000 erythrocytes
• A blood test to measure the amount of fetal hemoglobin (Hb F) transferred from a fetus to a mother's bloodstream, usually performed on Rh negative mothers to determine the required dose of immune globulin (RhIg) to inhibit formation of Rh antibodies in the mother and prevent Rh disease in future Rh positive children. In a newborn, half or more of the hemoglobin is fetal hemoglobin. The concentration of Hb F falls rapidly and by the age of one to two years it is less than 1%. [Miale, J.B., Laboratory Medicine Hematology, 6th ed. C.V. Mosby, St. Louis (MO) 1982, p 608.)] The Association of Blood Banks recommends counting adult and fetal erythrocytes in as many fields as required giving a total count of at least 2000 cells. Then calculate percent fetal cells in the total counted. [Technical Manual. American Association of Blood Banks, 16th ed. Arlington (VA) 2008, pp 936-937] This term was created for, but not limited in use to, the Fetal Hemoglobin Sure-Tech test kit. This assay is similar to term 48556-5 except that 2000 cells are counted rather than 1000 cells.
• 2000 RBC; Acid elution; Blood; Discocytes; Erthrocyte; Erythrocyte; Fetal cells; Fetal maternal hemorrhage screen; Fetal RBC; HEMATOLOGY/CELL COUNTS; Hemoglobin F-loaded erythrocytes; KB; Kleih Betke; Kleihauer stain; Kleihauer test; Kleihauer-Betke stain; Kleihauer-Betke test; Kleihauer-Braun-Betke; Number fraction; Percent; Point in time; QNT; Quan; Quant; Quantitative; Random; RBC; RBCS; Red blood cell; Red blood cells; Red blood corpuscle; Red blood corpusles; Red cell; Red cells; WB; Whole blood

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Frequently asked questions