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HelpTest Code PE-ST sFLT-1/PlGF ratio (Second trimester)
Laboratory Code
LAB3053541
Specimen Requirements
Specimen Type: Serum
Container/Tube: Gold Top (SSTII)
Volume: 5.0 mL
Minimum Volume: 0.8 mL serum
Collection Instructions: Allow specimen to clot for 30 mins and centrifuge within 2 hrs.
Specimen Stability
| Specimen Type | Serum |
|---|---|
| Ambient | Not available |
| Refrigerate | 48 hours |
| Frozen | 6 months |
Methodology
Electrochemiluminescent Immunoassay
Days and Times Performed
Monday through Friday, TAT 4 days
Specimen Condition
| Gross Haemolysis | Alert/Reject |
|---|---|
| Icterus | OK |
| Lipaemia | OK |
| Others | Not applicable |
Reference Interval
sFLT-1
| Gestational week | 5th percentile (ng/L) | Median (ng/L) | 95th percentile (ng/L) |
|---|---|---|---|
| 10 to 14 | 652 | 1328 | 2501 |
| 15 to 19 | 708 | 1355 | 2807 |
| 20 to 23 | 572 | 1299 | 2997 |
| 24 to 28 | 618 | 1355 | 3205 |
| 29 to 33 | 773 | 1742 | 5165 |
| 34 to 36 | 992 | 2552 | 7363 |
| 37 to delivery | 1533 | 3485 | 9184 |
sFLT-1/PIGF ratio
| Gestational week | 5th percentile | Median | 95th percentile |
|---|---|---|---|
| 10 to 14 | 9.27 | 24.8 | 54.6 |
| 15 to 19 | 3.51 | 10.5 | 25.7 |
| 20 to 23 | 1.82 | 4.92 | 14.6 |
| 24 to 28 | 0.945 | 3.06 | 10.0 |
| 29 to 33 | 0.941 | 3.75 | 33.9 |
| 34 to 36 | 1.23 | 9.03 | 66.4 |
| 37 to delivery | 2.18 | 19.6 | 112 |
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Aids in the diagnosis of pre-eclampsia in pregnant women.
Service Code
33318
LOINC Code Information
74757-6
Alias
Soluble fms-Like Tyrosine Kinase 1/ Placental Growth Factor
Update
Last Updated 12/03/2025