What is an rsID Number?

An rsID (reference SNP ID) is a unique identifier assigned to a specific genetic variation in your DNA. Think of it as a 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 can 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.

Other ways to identify SNPs

Sometimes a report references a SNP by its location on your chromosome instead of its rsID, like "Chromosome 11 Position 27658369."

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

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