What is an rsID Number?

An rsID (reference SNP ID) is a unique identifier assigned to specific genetic variations in your DNA. It works like a genetic reference number that helps scientists and databases track the same variation across studies and people worldwide.

Understanding rsID Numbers

Your DNA contains millions of locations where people have different genetic variations, called SNPs (Single Nucleotide Polymorphisms). Each SNP is assigned a unique rsID to make it easy to identify and discuss. For example:

  • rs6265 identifies a variation in the BDNF gene that affects a protein involved in brain function.
  • About 20% of people carry the 'T' variant of this SNP.

Alternative Ways to Identify SNPs

Sometimes reports reference a SNP by its location on your chromosome instead of its rsID, like: "Chromosome 11 Position 27658369"

This location refers to the same genetic variation—the rsID just provides a simpler, standardized label that researchers and databases use worldwide. Both formats describe the exact same spot in your DNA.

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