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Test Code GXM Type and Screen

Important Note

For NUH patients: To be ordered by clinician or certified APNs. Sample must be taken by GXM certified nurse or phlebotomist if not taken by a doctor. Strictly for clinical use only.

For external clients (NRL): To consider ABORH instead. Otherwise to discuss with BTS supervisor prior to accepting orders.

Laboratory Code

LAB276

Specimen Requirements

Specimen Type: Whole Blood

Container/Tube: EDTA Pink Top
Volume: 6.0 mL

Specimen Stability

Ambient Freshly drawn samples (preferred)
Refrigerate 3 days
Frozen Not applicable

Group and Crossmatch (Pre-Admission Testing) samples are valid for 3 days after the day of operation. Please ensure that operation falls within 45 days from the date of collection.

Methodology

Immune Agglutination

Days and Times Performed

Monday through Sunday

TAT Remarks
2 hrs to 3 days (Routine)

Exact time may vary depending on situation

For example; ABO discrepancies, Antibodies detected
1 hr (STAT)

Specimen Condition

Gross Haemolysis Reject
Icterus OK
Lipaemia OK
Others: Insufficient specimen Reject

Refer to Blood Transfusion Services Collection Guidelines for GXM rejection criteria.

Reflex Testing

Direct Antiglobulin (Coomb’s) Test
Antibody Titre, Others
Red Cell Phenotyping

Antibody Identification (Red Cells)

Testing Laboratory

National University Hospital
Transfusion Services, 67722305

Useful For

ABORh typing and antibody screening to screen and detect red cell antibody/ies.

This sample allow crossmatching of red cell units for transfusion.

Service Code

2012711

Alias

Group and Crossmatch (GXM)

Type and Screen

T&S

Update

Last updated 03/03/2025