Why does swelling occur after blood draw, and how should it be handled?
Apr 02, 2023
Source: Cainiu Health
Dr. Yang Shuwen
Introduction
Swelling at the site after blood draw is usually caused by insufficient pressure application or the blood vessel not fully closing. This can be improved through methods such as applying pressure, cold or warm compresses, or incision and drainage of the hematoma if necessary. Additionally, when local swelling occurs, avoid contact with water for a short period and keep the area dry and clean to prevent infection.
Localized swelling after blood draw is usually caused by insufficient pressure application time or incomplete closure of the blood vessel. This can be improved through methods such as compression, cold and warm compresses, or incision of the hematoma. Specific measures are as follows:
1. Compression
Swelling (hematoma) after blood collection is often due to inadequate compression time. Generally, pressure should be applied for about 5 minutes, depending on individual circumstances. For individuals with coagulation disorders, clot formation may be slower; therefore, it is recommended that these patients apply pressure for at least 15 minutes after blood draw.
2. Cold and Warm Compresses
Once bleeding has stopped at the puncture site, a cold compress can be applied within the first 24 hours to constrict blood vessels and effectively reduce swelling. After approximately 48 hours, warm compresses can be used to promote local blood circulation and aid in resolving the hematoma.
3. Incision of Hematoma
If the hematoma is severe, does not resolve over time, and is accompanied by bruising, surgical incision and drainage under medical supervision may be necessary.
In addition, medication may also be used as part of treatment. After localized swelling occurs, avoid contact with water for a short period and keep the area dry and clean to prevent infection.
