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Test Code BLOD5001 OB Type and Screen Prenatal

Useful For

Determining the blood type (ABO/Rh) of maternal red blood cells and detecting the presence of irregular antibodies in maternal serum.  Early detection of Rh negative mothers and unexpected antibodies in maternal serum is important in protecting the fetus from hemolytic disease.


Capture solid phase automation and manual blood banking methods

Performing Laboratory

Bozeman Health Laboratory Services

Specimen Requirements

Specimen Type: Whole blood

Container/Tube: Pink top preferred (K2 EDTA),  or Purple top (EDTA)

Specimen Volume: 6 mL

Specimen Minimum Volume: 3 mL

Collection Instructions:  Do not centrifuge. Forward unprocessed whole blood promptly.

Specimen Rejection: Gel tubes are not acceptable.  Specimen must be labeled properly.  This test is affected by gross hemolysis.

Note: If specimen being drawn may be used for a possible transfusion, refer to test  BLOD0947 TYPE AND SCREEN for banded specimen collection instructions and blood product transfusion instructions.

Specimen Transport Temperature

Ambient <24 hours/Refrigerated >24 hours

Specimen Stability


Specimen Type Temperature Time
Whole Blood EDTA Ambient 24 hours
  Refrigerated 4 days


Reference Values

Type: A, B, O, AB, A2

Rh: Positive or Negative

Antibody Screen: Negative (reported as positive or negative)


If the antibody screen is positive, an antibody identification, antigen screen, and direct Coombs will be performed at an additional charge.

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding


86901-Rh type

86850-Antibody screen

86870-Antibody identification (if appropriate)
86880-Antiglobulin (direct Coombs) (if appropriate)
86905-Each red cell antigen typing (if appropriate)