Whatever the results are, we must keep in mind that the method used must be safe, simple, reproductive, quite physiological. The RNL with distal registration during 40 min give more precise and reliable informations particularly in transient or permanent lymphatic dysfunctions. This should be the protocol used for the assessment of the lymphatic function and the treatment efficacy. The RNL with nodal uptake registration is totally related to the lymphatic transport from the extremities and the exercise applied. When performed by well trained physicians concerned with the lymphatic physiology and informed of all factors interfering with the results, the quantitative functional lymphoscintigraphy is really giving objective and reproductive parameters to evaluate a treatment efficacy (decongestive physiotherapy, surgery, drugs) in lymphedemas useful to assess new lymphotonic treatments.