Interpretation of Amniotic Fluid White Blood Cell Count in “Bloody Tap” Amniocenteses in Women With Symptoms of Preterm Labor

. Author manuscript; available in PMC: 2014 Aug 25.

Published in final edited form as: Obstet Gynecol. 2010 Aug;116(2 0 1):344–354. doi: 10.1097/AOG.0b013e3181e8fec6

Amniotic fluid:
WBC count: 267 cells/mm³
RBC count: 10,400 cells/mm³
glucose 13 mg/dL
LDH: 1,470 U/L
Gram stain: negative

Predicted

WBC count = 10,400 \times \frac{14,200 \times 101}{28.9 \times 10^{7}} = 52 {cells / mm}^{3}

Corrected WBC count = 267 − 52 = 215 cells/mm³

Corrected WBC count (rapid subtraction) = 267 − 50 = 217 cells/mm³

Maternal hematology:
WBC count: 14,200 cells/mm³
Hematocrit: 28.9%
MCV: 101 fL