How to Prevent Hematoma After Taking a Blood Test

Do you know that the most common complication after a blood test is hematoma? It looks like a bruise, which is actually bleeding under the skin. It can be relatively small, but it also can be quite large and painful. The size of a hematoma depends on how much your vein is injured, and if preventive measures were taken straight away after a needle was pulled out of your vein.

Remember that a hematoma is not supposed to happen! It can only occur because a phlebotomist made an error while performing the blood draw. Quite a few of the errors can cause a hematoma, but I’m not going to discuss them in my article. Let me tell you what you should know to prevent a hematoma.

After having your blood drawn, apply pressure with your finger for at least a minute as soon as a piece of gauze is placed on the site of the draw. Bending your arm is not an accurate way to apply pressure. You should hold your finger over the venipuncture site because applying a pressure bandage is not enough. Ideally, you should apply pressure for 10-20 minutes. While leaving the medical facility, still apply pressure until it is safe to continue with your day.

If after removing the bandage, you notice a small bruise that continues to grow, apply pressure to the entire area and hold the site above your heart if possible. If at any time, any of these symptoms begin to worry you, you should never hesitate to return to the office for examination.

If despite your efforts, the hematoma was formed, apply cold packs to the area to reduce inflammation, and alleviate some pain. Ibuprofen also helps to reduce inflammation, and manage pain.

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  1. Thanks for the information. I didn’t realise that those bruises were haematomas.


  2. I agree with your article. Just apply a bit pressure and massage the are so that hematoma will be prevented.

  3. never had that effect but now I know how to prevent it should it happen.

  4. Thanks for sharing

  5. great article

  6. I seem to get that quite often when I donate blood. Hopefully, I can prevent it with your tip.

  7. nice share… thnks for the information

  8. Play Boy Tommy? No, phlebotomist. Right. Good information and thanks. Another danger is Air Bubbles which spells sure death unless some quick manoeuvres are made. Hospital mistakes are quite common unless we have experts like you.

  9. Nice Share.


  10. Nice share

  11. I’ve learned new facts about Hematoma. Thanks for the share.

  12. Thanks for the information. I have my blood drawn frequently and quiet often there is a large bruise. I didn’t realize it was caused by error.

  13. Thank you for letting us know about hematoma. I heard about it, but I didnt know what it was or how you got it.

  14. Thanks for that tip. I haven’t noticed any hematomas in my recent visit to the phlebotomist (that’s a new term for me) :-)

  15. Thanks for sharing this. I do not much about this topic.

  16. interesting facts

  17. Informative. Thanks.

  18. :P

    I like it.


  19. A very informative article and a good thing to know. Thanks for sharing this article.

  20. This term hematoma is new to me and thought bleeding after a test is normal.

  21. Thanks for sharing

  22. So much to learn and gain knowledge from this article. Good share!

  23. I will do that next time I have a blood test.

  24. nice post

  25. ok but sometimes in the very elderly the skin is so fragile and the flesh is so lacking around the vein that even the smallest possible needle will cause a hematoma. This is made worse if the patient is on blood thinners so its wrong to tell people that it is all the blood takers fault.

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