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Obstetric Panel

Test Code


CPT Code(s)



CBC (includes Differential and Platelets)
Antibody Screen, RBC with Reflex to Identification, Titer, and Antigen Typing
ABO Group and Rh Type
RPR (Diagnosis) with Reflex to Titer and Confirmatory Testing
Hepatitis B Surface Antigen with Reflex Confirmation*
Rubella Virus IgG Antibody

If Antibody Screen is positive, Antibody Identification, Titer, and Antigen Typing will be performed at an additional charge (CPT code(s): 86870, 86886, 86905).
If RPR screen is reactive, RPR Titer and FTA Confirmatory testing will be performed at an additional charge (CPT code(s): 86593, 86780).
If Hepatitis B Surface Antigen is positive, confirmatory testing based on the manufacturer's FDA approved recommendations will be performed at an additional charge (CPT code(s): 87341).

*Note: When only a single test, Hepatitis B Surface Antigen, is ordered to diagnose Hepatitis B in a pregnant woman, additional tests such as liver enzymes should be ordered to confirm the diagnosis.

Preferred Specimen(s)

Whole blood full EDTA (lavender-top) tube and
Whole blood full ACD-A or ACD-B (yellow-to) tube and
6 mL serum

Collection Instructions

EDTA (lavender-top): Maintain specimen at room temperature. Do not refrigerate. Collect EDTA (lavender-top) tube last. Traumatic draw can introduce thromboplastin and trap WBC and platelets. Refrigeration can precipitate fibrin and trap WBC and platelets.

Transport Container

EDTA (lavender-top) tube and
ACD-A or ACD-B (yellow-top) tube and
Transport tube

Transport Temperature

Room temperature

Reject Criteria

Gross hemolysis • Grossly lipemic


See individual tests

Performing Laboratory

Quest Diagnostics - West Region

Reference Range(s)

See Laboratory Report

Clinical Significance

See individual tests

Alternative Name(s)

OB Panel, Prenatal Panel

LOINC®' Code(s)

The Result and LOINC information listed below should not be used for electronic interface maintenance with Quest Diagnostics. Please contact the Quest Diagnostics Connectivity Help Desk for more information at 800-697-9302.

NOTE: The codes listed in the table below are not orderable Test Codes.

Result NameLOINC CodeComponent Name
30000000WHITE BLOOD CELL COUNT6690-2Leukocytes
30000100RED BLOOD CELL COUNT789-8Erythrocytes
30000400MCV787-2Erythrocyte mean corpuscular volume
30000500MCH785-6Erythrocyte mean corpuscular hemoglobin
30000600MCHC786-4Erythrocyte mean corpuscular hemoglobin concentration
30000700RDW788-0Erythrocyte distribution width
30000800PLATELET COUNT777-3Platelets
30000900NEUTROPHILS770-8Neutrophils/100 leukocytes
30001100BAND NEUTROPHILS764-1Neutrophils.band form/100 leukocytes
30001110ABSOLUTE BAND NEUTROPHILS26507-4Neutrophils.band form
30001300METAMYELOCYTES740-1Metamyelocytes/100 leukocytes
30001310ABSOLUTE METAMYELOCYTES30433-7Metamyelocytes
30001500MYELOCYTES749-2Myelocytes/100 leukocytes
30001510ABSOLUTE MYELOCYTES30446-9Myelocytes
30001520PROMYELOCYTES783-1Promyelocytes/100 leukocytes
30001530ABSOLUTE PROMYELOCYTES26523-1Promyelocytes
30001700ABSOLUTE NEUTROPHILS751-8Neutrophils
30001800LYMPHOCYTES736-9Lymphocytes/100 leukocytes
30002000REACTIVE LYMPHOCYTES13046-8Lymphocytes.variant/100 leukocytes
30002110ABSOLUTE LYMPHOCYTES731-0Lymphocytes
30002200MONOCYTES5905-5Monocytes/100 leukocytes
30002400ABSOLUTE MONOCYTES742-7Monocytes
30002500EOSINOPHILS713-8Eosinophils/100 leukocytes
30002700ABSOLUTE EOSINOPHILS711-2Eosinophils
30002800BASOPHILS706-2Basophils/100 leukocytes
30003000ABSOLUTE BASOPHILS704-7Basophils
30003400BLASTS709-6Blasts/100 leukocytes
30003500ABSOLUTE BLASTS30376-8Blasts
30003600NUCLEATED RBC19048-8Erythrocytes.nucleated/100 leukocytes
30003610ABSOLUTE NUCLEATED RBC30392-5Erythrocytes.nucleated
30004200COMMENT(S)8251-1Service comment
30004600MPV776-5Platelet mean volume
35008400ANTIBODY SCREEN, RBC W/REFL ID, TITER AND AG890-4Blood group antibody screen
35008200ABO GROUP883-9ABO group
35008300RH TYPE10331-7Rh
55019300HEPATITIS B SURFACE ANTIGEN5196-1Hepatitis B virus surface Ag
55019600CONFIRMATION7905-3Hepatitis B virus surface Ag
70012000RUBELLA ANTIBODY (IGG)5334-8Rubella virus Ab.IgG

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

LOINC assignment is based on a combination of test attributes, including the method used by the performing laboratory. For tests not performed by Quest Diagnostics, codes are assigned by the performing laboratory.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.