Just to make sure it's clear to everyone, you need to extract every dose with the special syringes - not just the 6th one. If you use the low dead space syringe

Just to make sure it's clear to everyone, you need to extract every dose with the special syringes - not just the 6th one. If you use the low dead space syringes for the first 5 doses, the efficiencies add up to enough solution left over for a guaranteed 6th one.