Final answer:
The 1st Trimester Combined Test includes an ultrasound scan and a maternal blood test to assess the baby's development and determine the risk of chromosomal abnormalities.
Step-by-step explanation:
The components of a 1st Trimester Combined Test include:
- Ultrasound scan: This is done to assess the baby's development and to determine gestational age.
- Maternal blood test: This involves measuring hormone levels, such as human chorionic gonadotropin (hCG) and pregnancy-associated plasma protein (PAPP-A), which can indicate the risk of chromosomal abnormalities like Down syndrome.