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Test Code 3801 Lamellar Bodies, Amniotic Fluid

Methodology

Coulter Counter (Electrical Impedance)

Performing Laboratory

Barnes-Jewish Hospital Laboratory

Specimen Requirements

Specimen Type: Amniotic fluid
Container/Tube: Lavender top (EDTA); plain red top; or screw-capped, plastic vial
Specimen Volume: 1 mL
Specimen Minimum Volume: 1 mL
Collection Instructions: Specimen should be free of contaminants such as blood, mucus, or meconium.

Specimen Transport Temperature

Ambient

Reference Values

Mature: ≥50,000/mcL

Literature References:

1. Neerhof MG, Dohnal JC, Ashwood ER, Lee IS, Anceschi MM. Lamellar body counts: a consensus protocol. Obstet Gynecol 2001;97:318-20.

2. Dubin SB. Assessment of fetal lung maturity. Am J Clin Pathol 1998;110:723-32.

3. Lafler D, et al. Refrigerated and frozen amniotic fluid for fetal lung maturity testing and lamellar body density counts. Laboratory Medicine November 1996;27:770-4.

4. Baumann NA. Eby C, Gronowski A. Lamellar body counts (LBC) are affected by specimen storage conditions. Department of Pathology, Division of Laboratory Medicine, Washington University School of Medicine.

Day(s) Test Set Up

Monday through Sunday

Turnaround Time:
STAT: 1 hour after receipt in laboratory 
Routine: 1 hour after receipt in laboratory

Test Classification and CPT Coding

85049

Additional Information

For BJH Laboratory Use Only
Analyte Stability:

7 days at ambient temperature

Laboratory Processing Instructions:
Test performed in BJH Hematology.

LOINC Code Information

Name LOINC Code
Lamellar Bodies 19114-8