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Tests
A blood test done near the end of the first trimester of pregnancy to screen for common chromosomal defects. This test screens for blood levels of both free beta-human chorionic gonadotrophin (beta-hCG) and pregnancy-associated plasma protein A (PAPP-A) and can detect trisomies of chromosomes 21 (Down's syndrome), chromosome 18 (Edward's syndrome), and chromosome 13 (Patau's syndrome).
Article
Research record from Methods Protoc, 2026-08-24. PMID 42776677.
Tests
The determination of the amount of free choline, glycerophosphorylcholine, and phosphorylcholine present in a sample.
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The determination of the amount of free choriogonadotropin beta present in a sample.
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The determination of the free complement C2 present in a sample.
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The determination of the amount of free complement C5 present in a sample.
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The determination of the amount of free epidermal growth factor receptor present in a sample.
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The determination of the amount of free erythrocyte protoporphyrin present in a sample.
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The determination of the amount of free estradiol present in a sample.
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The determination of the ratio of free estradiol compared to total estradiol present in a sample. The measurement may be expressed as a ratio or percentage.
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The determination of the amount of free hemoglobin present in a sample.
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The determination of the amount of free Immunoglobulin E in a sample.
