Home
HelpTest Code PCS2 Pre-Conception Screen
Specimen Requirements
ABO Group and Rh Type (ABORh)
Preferred
Specimen Type: Whole Blood
Container/Tube: EDTA Lavender Top
Volume: 3.0 mL
Minimum Volume: 3.0 mL whole blood
Acceptable
Specimen Type: Whole Blood
Container/Tube: EDTA Pink Top
Volume: 6.0 mL
Minimum Volume: 6.0 mL whole blood
HBsAg, Anti-HBs, Anti-HCV, Syphilis Ab, Anti-HIV Ag-Ab, RUBG, VZG
Specimen Type: Serum
Container/Tube: Gold Top (SSTII) / Red Top
Volume: 5.0 mL / 6.0 mL Blood
Minimum Volume: 1.0 mL serum
Collection Instructions: Allow specimen to clot for 30 mins and centrifuge within 2 hrs.
Thalassaemia Screen (THALS)
Preferred
Specimen Type: Whole Blood
Container/Tube: Lavender Top (EDTA)
Volume: 5.0 mL
Minimum Volume: 3.0 mL
Collection Instructions: Send whole blood specimen to the laboratory immediately.
Acceptable
Specimen Type: Cord Blood
Container/Tube: Lavender Top (EDTA)
Volume: 5.0 mL
Minimum Volume: 3.0 mL
Collection Instructions: Send whole blood specimen to the laboratory immediately.
Specimen Stability
ABO Group and Rh Type (ABORh)
Samples are kept for 14 days. Test best performed on fresh drawn samples
HBsAg, Anti-HBs, Anti-HCV, Syphilis Ab, Anti-HIV Ag-Ab, RUBG, VZG
| Specimen type | Serum |
|---|---|
| Ambient | 8 hours |
| Refrigerate | 6 days (preferred) |
| Frozen | 8 months (avoid repeated freeze/thaw cycles) |
Thalassaemia Screen (THALS)
| Specimen type | Whole Blood |
|---|---|
| Ambient | 8 hours |
| Refrigerate | 1 day |
| Frozen | Not available |
Panel Information
Panel includes the following tests:
Methodology
See individual test listings for methodology
Days and Times Performed
| ABO Group and Rh Type (ABORh) | 24 hrs, TAT 1 day |
|---|---|
| HBsAg, Anti-HBs, Anti-HCV, Syphilis Ab, Anti-HIV Ag-Ab, RUBG | Monday through Friday, TAT 1 - 3 days |
| Varicella Zoster IgG (VZG) | Tuesday, Friday, TAT 2 - 5 days |
| Thalassaemia Screen (THALS) | Monday through Friday, Office hours, TAT 5 – 21 working days (for identification of abnormal variants) |
Specimen Condition
ABO Group and Rh Type (ABORh)
| Haemolysis | Gross Invalidate Result |
|---|---|
| Icterus | Not applicable |
| Lipaemia | Not applicable |
| Others | Insufficient sample will be rejected |
HBsAg, Anti-HBs, Anti-HCV, Syphilis Ab, Anti-HIV Ag-Ab, RUBG, VZG
| Gross Haemolysis | Reject |
|---|---|
| Icterus | OK |
| Lipaemia | OK |
| Others | Not applicable |
Thalassemia Screen
| Haemolysis | OK |
|---|---|
| Icterus | OK |
| Lipaemia | OK |
| Others: Clotted or insufficient specimen | Reject |
Reference Interval
See individual test listings for reference interval
Testing Laboratory
| ABORh | National University Hospital, Singapore Transfusion Services, 67722305 |
|---|---|
| HBsAg, Anti-HBs, Anti-HCV, Syphilis Ab, Anti-HIV Ag-Ab, RUBG, VZG | National University Hospital, Singapore Clinical Chemistry, 67724346 |
| FBC, THALS | National University Hospital, Singapore Haematology, 67725354 |
Useful For
| ABO Group and Rh Type (ABORh) | Determine ABO and Rh (D) blood group |
|---|---|
| Thalassaemia Screen (THALS) | Investigation of thalassaemia and other haemoglobinopathies |
| HBsAg, Anti-HBs, Anti-HCV, Syphilis Ab, Anti-HIV Ag-Ab, RUBG, VZG | Blood tests to evaluate and prepare for a healthy pregnancy. |
Service Code
34021
LOINC Code Information
See individual test listings for LOINC code information
Update
Last updated 24/02/2025