text: user2027: I have a list of dbSNP rsIDs for GRCh37 and I want to convert them to the equivalent IDs in GRCh38. This is using the most recent dbSNP build (150 as of the time of this post). Is there any ID mapping available? If not, are there any tools I can use?
  
  user931: See also CrossMap:
  http://crossmap.sourceforge.net/
  20, 21, 22, 23, 24, 30
  
  user939: Did you try the liftOver tool of UCSC? You'll need a BED file with your SNPs coordinates for this.
  You can also do this in R with rtracklayer.
  library(rtracklayer)
  ?liftOver
  
  
  user77: You can assume that the overwhelming majority of rsIDs are the same between GRCh37 and GRCh38 (they're semi-stable IDs). There are, however, a number of rsIDs that are present only in GRCh37, which you can find here. Note that the format of this file is a bit strange, it's chromosome|position|ID|weight, where position is sometimes empty, weight is typically 1, and ID is the rsID without the rs prefix.
  Also, some rsIDs have a different strand. This is less likely to be an issue for you, but it's there in case you need it.
  
original_text: 2027: <p>I have a list of dbSNP rsIDs for GRCh37 and I want to convert them to the equivalent IDs in GRCh38. This is using the most recent dbSNP build (150 as of the time of this post). Is there any ID mapping available? If not, are there any tools I can use?</p>
   931: <p>See also CrossMap:
  <a href="http://crossmap.sourceforge.net/" rel="nofollow noreferrer">http://crossmap.sourceforge.net/</a></p>
  
  <p>20, 21, 22, 23, 24, 30</p>
   939: <p>Did you try the <a href="http://genome.ucsc.edu/cgi-bin/hgLiftOver" rel="nofollow noreferrer">liftOver</a> tool of UCSC? You'll need a BED file with your SNPs coordinates for this.</p>
  
  <p>You can also do this in <code>R</code> with <code>rtracklayer</code>.</p>
  
  <pre><code>library(rtracklayer)
  ?liftOver
  </code></pre>
   77: <p>You can assume that the overwhelming majority of rsIDs are the same between GRCh37 and GRCh38 (they're semi-stable IDs). There are, however, a number of rsIDs that are present only in GRCh37, which <a href="ftp://ftp.ncbi.nih.gov/snp/organisms/human_9606/known_issues/b150_rs_without_GRCh38_mapping.bcp" rel="noreferrer">you can find here</a>. Note that the format of this file is a bit strange, it's <code>chromosome|position|ID|weight</code>, where <code>position</code> is sometimes empty, <code>weight</code> is typically 1, and <code>ID</code> is the rsID without the <code>rs</code> prefix.</p>
  
  <p>Also, <a href="ftp://ftp.ncbi.nih.gov/snp/organisms/human_9606/known_issues/b150_rs_GRCh37_to_GRCh38_orientation_flip.bcp" rel="noreferrer">some rsIDs have a different strand</a>. This is less likely to be an issue for you, but it's there in case you need it.</p>
  