I don't have a percentage for the saline. Should I answer this near not enough information? Assuming you aim a blood replacement, rather than for mixing beside stored blood, saline infused into humans is isotonic with blood. The standard percentage solution is 0.9%.
0.9% ability 0.9 g per 100 ml
Therefore for 3 l you need 0.9 x 30 = 27 g of NaCl
Im not sure if I get your question right, i dont know what u imply with bloodbank saline but a liter of NS have ,9 of NACL.
3 liters of blood contains 1650 ml of serum. . Rough estimation is , it contains 1600 ml of saline. Saline is 9 gms per liter . so the salt NaCl within 1600 of saline is 15.4gms.
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