Could you please help me get the expansions for these abbreviations??

they're defined in the VCF header.

e.g:

##FORMAT=<ID=DP,Number=1,Type=Integer,Description="Approximate read depth (reads with MQ=255 or with bad mates are filtered)">

Hello,

have a look at the header entries of your vcf file (those lines starting with ## at the top of the file). All fields are described there.

If you doesn't understand a description feel free to ask.

fin swimmer

Have a look at this page - I think they neatly explain various entries.

I encountered such a VCF in a support thread, and I still have no idea what third party tool generates these. But the VCF header describes these fields.

##FORMAT=<ID=GT,Number=1,Type=String,Description="Genotype">
##FORMAT=<ID=GQ,Number=1,Type=Float,Description="Genotype Quality">
##FORMAT=<ID=DP,Number=1,Type=Integer,Description="Read Depth">
##FORMAT=<ID=SR,Number=1,Type=Float,Description="Supporting reads">
##FORMAT=<ID=VR,Number=1,Type=Float,Description="Variant reads">
##FORMAT=<ID=VA,Number=1,Type=Integer,Description="1=Variant ambiguous, Genotype at this location is not clear, otherwise VA=0">
##FORMAT=<ID=SB,Number=1,Type=Float,Description="Strand bias">
##FORMAT=<ID=ABQ,Number=1,Type=Float,Description="Average base quality">
##FORMAT=<ID=AMQ,Number=1,Type=Float,Description="Average mapping quality">

Also peculiar is that SR (Supporting reads) and VR (Variant reads) are not whole numbers and instead look like VAF, Variant Allele Fraction as a percentage value.