To establish a safe, effective, simple, and more economically feasible method to obtain platelet-rich plasma (PRP).

Whole blood was collected from 24 patients with atrophic acne scars on the face. For the preparation of PRP, a slight modification of Choukroun＇s method was used. Enzyme-linked immunosorbent assay (ELISA) was used to measure the levels of platelet derived growth factor-β(PDGF-β), transforming growth factor-β1 (TGF-β1), epidermal growth factor (EGF), vascular endothelial growth factor (VEGF), basic fibroblast growth factor (bFGF), isulin-like growth factor-1 (IGF-1) in normal plasma and PRP.

The average concentration of PDGF-β in PRP was (755.61±418.31) ng/L, which was higher than [(479.93±279.18) ng/L] in normal plasma (t=3.479, P<0.01). The average concentration of TGF-β1 in PRP was (2267.00±1223.68), which was higher than [(1535.50±910.91) ng/L] in normal plasma (t=7.082, P<0.01). The average concentration of EGF in PRP was (30.70±12.39) ng/L, which was higher than [(20.77±10.31) ng/L] in normal plasma (t=6.899, P<0.01). The average concentration of VEGF in PRP was (25.42±17.69) ng/L, which was higher than [(12.01±7.77) ng/L] in normal plasma (t=5.230, P<0.01). The average concentration of bFGF was (17.85±7.17) ng/L, which was higher than [(10.90±4.73) ng/L] in normal plasma (t=6.050, P<0.01). The average concentration of IGF-1 was (201.22±36.80) ng/ml, which was higher than [(174.90±33.80) ng/ml] in normal plasma (t=3.760, P<0.01).

Compared to normal plasma, modified PRP contains higher levels of growth factors. The modified method is a reliable option for liquid PRP, especially applicable for invasive cosmetic laser surgery to promote wound repair.

Platelet-rich plasma; Modification method; Platelet-rich plasma; Growth factors; Enzyme-linked immunosorbent assay; Concentration