Chromosomal pairs

Every person has 23 pairs of chromosomes. There are 22 pairs known as autosomes and 1 pair of sex chromosomes (X and Y). If there is an extra or a missing chromosome in any of these pairs, it is known as an aneuploidy.

4 6 23

Microdeletion syndromes

A microdeletion is the absence or ‘deletion’ of small amounts of chromosomal DNA. The chromosomal location and size of the deletion determines the type and severity of the syndrome present.

0 6 9

Sex chromosomes

Every person has 2 sex chromosomes. XX for a female genotype and XY for a male genotype. Sometimes there is an extra or missing sex chromosome, this is known as a sex chromosome aneuploidy.

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Gender identification

If gender identification is requested, we can screen the sex chromosomes and report on whether the chromosomes present mean the baby is likely to be a male or a female. In twin pregnancies, it is only possible to determine if the Y chromosome is present, which if detected means at least one of the babies is likely to be a male.

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Total price

£ 595

£ 695

£ 995

Know your options: Which Vision test is right for you

Our Vision prenatal test uses technology from the world’s leading DNA sequencing company, Illumina, making it a safer alternative to amniocentesis or chorionic villus sampling by removing the associated risk of miscarriage. To give parents the widest choice, Vision is available in several formats:

  • Chromosomal pairs 13, 18, 21
  • Sex chromosomes
  • Chromosomal pairs 9, 13, 16, 18, 21
  • Sex chromosomes
  • 6 microdeletion syndromes
  • All 23 chromosomal pairs
  • Sex chromosomes
  • 9 microdeletion syndromes