Chromosome Conditions Explained: Understanding the Genetic Blueprint

Every human life begins with a complex set of instructions stored within our cells. When we talk about chromosomes, we are essentially looking at the manual for human development. At Western Imaging for Women, we believe that understanding these conditions is the first step toward making empowered decisions for your family’s future.  

What are Chromosomes?

Chromosomes are thread-like structures located inside the nucleus of our cells that carry our genetic information (DNA).  

• The Standard Set: Typically, humans have 23 pairs of chromosomes, totaling 46 in each cell.  

• Inheritance: We inherit one chromosome in each pair from our biological mother and one from our biological father.  

• Genetic Instructions: These chromosomes contain the genes that determine everything from eye colour to how our internal organs function.  

How Chromosome Conditions Occur

A chromosome condition occurs when there is a change in the number or structure of these 23 pairs. These changes usually happen randomly during the formation of reproductive cells or early fetal development.  

1. Numerical Changes (Aneuploidy)

This is when a person has an extra or missing chromosome.  

• Trisomy: Having an extra chromosome (three instead of two). The most common examples include Down syndrome (Trisomy 21), Edwards syndrome (Trisomy 18), and Patau syndrome (Trisomy 13).  

• Monosomy: Having a missing chromosome (one instead of two).  

2. Structural Changes

These conditions occur when large segments of DNA are missing (deletions) or extra (duplications) within a specific chromosome. Even if the total number of chromosomes is correct, these missing or extra pieces can significantly impact development.  

3. Sex Chromosome Variations

Sometimes, changes occur in the 23rd pair—the X and Y chromosomes that determine biological sex. These conditions can affect growth, hormone production, and fertility.  

The Role of Percept NIPT in Detection

Because these conditions are microscopic, they cannot be seen on a standard scan alone. The Percept NIPT is a genome-wide screen that analyses the small pieces of DNA from the pregnancy found in the mother’s blood.  

• Broad Screening: It evaluates all 23 pairs of chromosomes to identify potential numerical or structural changes.  

• Voluntary Insight: Choosing to screen for these conditions is entirely voluntary, and many families use this information to prepare for their baby’s specific needs.  

The WIFW Specialist Approach

At our Maribyrnong clinic, we provide more than just a results paper. We understand that hearing terms like “Trisomy” or “Microdeletion” can be overwhelming. The Western Imaging Team ensures that every discussion is supported by our obstetrician-trained doctors.

By performing a specialist viability ultrasound before your blood draw, we confirm your pregnancy’s health and provide immediate verbal feedback. Whether you are visiting from Sunshine, Footscray, or Essendon, we offer a supportive environment where you can ask questions and receive expert guidance on your screening options.  

Ensure your pregnancy journey is guided by specialist expertise. Reach out to our team today or book your 10-week NIPT and scan online.