My mother age is 85 years old.always her hemoglobin lively is 6.3 month before she have applied 4 nobs of blood.after applied the blood hemoglobin range increased 10 bus further lively down.all test are completed all are

My mother age is 85 years old.always her hemoglobin lively is 6.3 month before she have applied 4 nobs of blood.after applied the blood hemoglobin range increased 10 bus further lively down.all test are completed all are ok but why hemoglobin lively down