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12 Cards in this Set
- Front
- Back
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Name the two types of ultrasound scans. |
Dating and anomaly |
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What do dating scans determine? When are they done? |
Pregnancy stage and due date. 8-14 weeks |
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What do anomaly scans determine? When are they done? |
Serious physical abnormalities, 18-20 weeks |
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What is the role of antenatal screening? |
Identifies the risk of a disorder so further tests can be taken |
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Why are routine blood and urine test carried out throughout the pregnancy? |
To moniter the concentration of marker chemicals |
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How can a false positive result occur? |
When measuring a chemical at the wrong time |
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When are diagnostic test offered? |
When there is an atypical chemical concentration |
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How are CVS and amniocentesis carried out? |
Feral cells are obtained from a sample of placenta (CVS) or amniotic fluid (amniocentesis) for karotyping |
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Compare the advantages and disadvantages of CVS to Amniocentesis |
CVS has a higher risk of miscarriage than amniocentesis. Amniocentesis is carried out later then CVS |
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Why are observed and predicted inheritance ratios often different? |
Because fertilisation is a random process |
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What is the role of postnatal screening? |
To test for metabolic disorders |
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Why are individuals with PKU placed on a strict diet? |
So they can obtain tyrosine from their diet and produce melanin |
