CVVHDF = Continuous veno-venous hemodiafiltration

CVVHFD = Continuous veno-venous high flux dialysis

Basically, CVVHDF uses both replacement fluid and dialysate, but CVVHFD uses dialysate only (no replacement fluid).

Please refer to this: http://www.criticalcare.org.za/images/Continuous_Renal_Replacement_Therapies_-_Michele_Susca.pdf

Hope this helps!

thanks alot