Is sweat considered to be isotonic, hypertonic, or hypotonic?

Question

Also, a patient lost 4000mL through sweat and drank 22500mL red bulls before going to work in the sun, and would his blood be considered isotonic,hypertonic,or hypotonic?

Answer 1

sweat is hypertonic.

for the 2nd question, each electrolyte's concentration needs to be provided.