is OG reading valid if i just pitched yeast??

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Brewkowski

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I was rushing when i pitched my starter and as soon as I did I realized I forgot to take a OG reading. So immediately grabbed the thief and took the reading, but how accurate is it with a yeast starter in it? Does that affect gravity or is it only that once you pitch yeast your gravity begins to decline that it makes for a bad reading?
 
Actually, it should be more accurate, final ABV wise. Not as accurate with respect to efficiency and boil-off determination though.
 
I did pitch the entire starter, and it was about 1.5 liters. It's a high gravity brew and the OG was 1.090.
 

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