護理師為病人皮下注射肝素（Heparin）。哪一個解剖部位最合適？

肝素的皮下注射旨在透過皮下脂肪組織進行吸收。腹部脂肪層較厚且血管分布均勻，是公認最適合皮下給藥的部位。注射時需避開臍周 2 英寸，以防因藥物刺激造成局部出血。相較於肌肉注射部位，腹部皮下注射能提供較穩定的吸收速率，是預防血栓形成時的標準給藥途徑。護理人員應在注射後輕壓部位，但不建議用力揉搓，以防導致皮下瘀青。

Subcutaneous heparin injection is intended to be absorbed through subcutaneous adipose tissue. The abdomen has a thick fat layer with uniform vascular distribution and is the recognized preferred site for subcutaneous administration. During injection, the area within 2 inches around the umbilicus should be avoided to prevent local bleeding from drug irritation. Compared with intramuscular sites, abdominal subcutaneous injection provides a more stable rate of absorption and is the standard route for thrombosis prevention. Nurses should gently press the site after injection but should not rub it vigorously, to avoid subcutaneous bruising.