Amniotic Fluid Flashcards
Anti-hCG source
Rabbit
hCG peaks during
1st Trimester of Pregnancy
Priciple of Home-based HCG Pregnancy test Kit
Enzyme Immunoassay
Cut-off point for pregnancy test kit
25 mIU/mL
Ultimate source of amniotic fluid water and solutes, and is a product of fetal metabolism
Placenta
primary function of Amniotic fluid
Cushion for the fetus
Stabilizes temperature
Allows fetal movement
Proper kung development
Amniotic fluid volume is from
Fetal urine and lung fluid
Normal Amniotic fluid volume in 3rd trimester
800 - 1200 mL
During the 1st trimester 35mL of AF is derived from
Maternal circulation
Fetal urine is the major contributor to the AF volume AFTER the
1st Trimester
Placed on ICE DELIVERY, kept REFRIGERATED or FROZEN
filtration prevents loss of PHOSPHOLIPIDS
Test for FETAL LUNG MATURITY
Kept at ROOM TEMPERATURE or at 37C
Test for CYTOGENETICS STUDIES
Protected from Light
Test for HDN
Detects premature rupture of membranes, also used to diagnosed EARLY PREGNANCY
Fern Test
Colorless- Pale Yellow
Normal
Traumatic tap, abd. Trauma, Intra-amniotic hemorrhage
Blood-Streaked
HDN Bilirubin
Yellow
Meconium 1st fetal bowel movement
Dark-Green
Fetal Death
Dark Red - Brown
Ratio of Mature Fetal Lungs
> = 2.0
CANNOT be performed in the presence of Blood and Meconium
L/S Ratio
Reference method for Alveolar Stability
Lecithin
Serves as a control due to constant production
Sphingomyelin
Amniostat FLM is an immunologic test for
Phosphatidylglycerol (PG)