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| 45170:SURFACTANT/ALBUMIN (S/A) RATIO | |||||||||
| Alias Names: | S/A Ratio | ||||||||
| Methodology: | Fluorescent Polarization | ||||||||
| Edit Date: | 6/11/2010 | ||||||||
| Performed: | Daily | ||||||||
| Released: | Within 1-2 hours of receipt in laboratory | ||||||||
| CPT Code: | 83663 | ||||||||
| Specimen Collection Details | |||||||||
| Collection: | 3 mL amniotic fluid. | ||||||||
| Handling: | Submit unspun specimen. Refrigerate. Include additional clinical information on requisition, i.e., weeks gestation, is patient diabetic, source if not amniotic fluid, e.g., vaginal pool. NOTE: Visible meconium or blood greater than 2% Hct may interfere with this assay. | ||||||||
| Stability: | 24-36 hours refrigerated, or 14 days frozen. | ||||||||
| Standard Volume: | 3 mL amniotic fluid. | ||||||||
| Minimum Volume: | 1 mL amniotic fluid. | ||||||||
| Transport: | Refrigerated if received in laboratory within 36 hours of collection, or frozen on dry ice if transport is delayed. | ||||||||
| Comments: | Clinic significance: Rapid test to determine fetal lung maturity. | ||||||||
| Rejection Criteria: | Refrigerated specimen received in laboratory more than 36 hours after collection. | ||||||||
| Reference Range: | |||||||||||||||||||
| ≥ 55 mg/gm |
relative low risk of RDS (in non-diabetics)
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| ≤ 54 mg/gm |
high risk of RDS cannot be excluded
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