AMNIOTIC FLUID
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TYPICAL REFERENCE INTERVALS |
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COMPONENT |
CONVENTIONAL UNITS |
FACTOR |
RECOMMENDED SI UNITS |
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APPEARANCE Early Gestation Term |
Clear Clear or slightly opalescent |
- - |
Clear Clear or slightly opalescent |
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ALBUMIN Early Gestation Term |
0.39 g/dL 0.19 g/dL |
10 |
3.9 g/L 1.9 g/L |
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BILIRUBIN Early Gestation Term |
<0.075 mg/dL <0.025 mg/dL |
17.10 |
<1.3 µmol/L <0.41µmol/L |
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CHLORIDE Early Gestation Term |
Approximately equal to serum chloride Generally 1-3 mEq/L lower than serum chloride |
- 1 |
Generally 1-3 mmol/L lower than serum chloride |
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CREATININE Early Gestation Term
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0.8 - 1.1 mg/dL 1.8 - 4.0 mg/dL (generally >2 mg/dL) |
88.40 |
71 - 97 µmol/L 159 - 354 µmol/L (generally >177 µmol/L) |
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ESTRIOL Early Gestation Term |
<10 µg/dL <60 µg/dL |
3.468 |
<347 nmol/L >2081 nmol/L |
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LECITHIN/SPHINGOMYELIN Early (Immature) Term (Mature) |
<1:1 >2:1 |
1 1 |
<1:1 >2:1 |
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OSMOLALITY Early Gestation Term |
Approximately equal to serum osmolality 230 - 270 mOsm/kg |
1 1 |
Approximately equal to serum osmolality 230 - 270 mmol/kg |
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PCO2
Early Gestation Term |
33 - 55 mm Hg 42 - 55 mm Hg (increases toward term) |
0.1333 |
4.4 - 7.3 kPa 5.6 - 7.3 kPa (increases toward term) |
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pH Early Gestation Term |
7.12 - 7.38 6.91 - 7.43 (decreases toward term) |
1 |
7.12 - 7.38 6.91 - 7.43 |
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PROTEIN, TOTAL Early Gestation Term |
0.60 ± 0.24 g/dL 0.26 ± 0.19 g/dL |
10 |
60 ± 2.4 g/L 2.6 ± 1.9 g/L |
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SODIUM Early Gestation Term |
Approximately equal to serum sodium 7 - 10 mEq/L lower than serum sodium |
1 |
7 - 10 mmol/L lower than serum sodium |
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CYTOLOGICSTAINING, OIL RED O Early Gestation Term NILE BLUE SULFATE Early Gestation Term |
<10% >50%
0 >20% |
0.01
0.01 |
Stained fraction: <0.1 >0.5
Stained fraction: <0.0 >0.2 |
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Urea Early Gestation Term |
18.0 ± 5.9 mg/dL 30.3 ± 11.4 mg/dL |
0.1665 |
3.00 ± 0.98 mmol/L 5.04 ± 1.90 mmol/L |
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URIC ACID Early Gestation Term |
3.72 ± 0.96 mg/dL 9.90 ± 2.23 mg/dL |
59.48 |
221 ± 57 µmol/L 589 ± 133 µmol/L |
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VOLUME Early Gestation Term |
450 - 1200 mL 500 - 1400 mL (increases toward term) |
0.001 |
0.45 - 1.2 L 0.5 - 1.4 L (increases toward term) |
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