Does anyone know what the average specific gravity of packed red cells washed with 0.9% saline is?

We calculate volume based on weight in grams and specific gravity. I'm about to start a method comparison between our cell washer and an OR's cell washer. Pre and post-volume is one of the parameters we're tracking but I can't seem to find a mention of the specific gravity of washed blood in the Technical manual.

Annadele

I could not find an answer to your question. All things being equal why don't you just base your study on the weight and hematocrit of the products. You are doing a comparison so the s.g. should be the same for both products, hence they should cancel each other out. (Assuming both systems are using the same saline and any other additives). Feel free to challenge my logic . . .

Have you tried using a refractometer? Don't know if it would be valid . . .