We calculated estimated fibrinogen concentration based on the formula in Fuji-san classification and compared measured on-site fibrinogen concentration by CG02N (A & T Corporation, Yokohama, Japan) to optimize fibrinogen replacement therapy.
The formula in Fuji-san classification is Fibrinogen concentration at the conclusion of surgery = 187.5 × (1 - exp(-(16000 × FFP )/(70 × BW × (100-Hct))) + FIB × exp(-(160 × FFP)/(70 × BW)). In this formula, FFP is fresh frozen plasma (units) transfused after heparin reversal, BW is patient’s body weight (kg) and FIB is fibrinogen concentration (mg/dl) at heparin reversal.
FIB estimation formula from Fuji-san classification gives good estimation of FIB in allogeneic blood transfusion case but not in hemodilutional autologous blood transfusion cases. The use of Fuji-san classification formula is limited to allogeneic FFP transfusion and autologous blood should be calculated with fibrinogen amount and circulating blood amount estimation.

Fujisan classification predicts fibrinogen concentration after allogeneic blood transfusion but not after hemodilutional autologous blood transfusion in cardiac surgery with cardiopulmonary bypass