When you are going through chemotherapy, there comes a moment when you hear, "Your blood counts dropped today, so you should get a transfusion before you go." Hearing that suddenly makes you afraid. You wonder whether your body has gotten that bad, and receiving someone else's blood can feel somehow heavy. But for people getting chemotherapy for blood cancer or other cancers, transfusion is more common than you might think. It is not because the treatment went wrong — it is closer to a natural part of the process that the treatment itself creates.
Why is that? Chemotherapy drugs attack fast-growing cells, but unfortunately the normal cells in the bone marrow that make blood take a hit along with them. The bone marrow is like a factory that stamps out red blood cells, white blood cells, and platelets, and as you go through repeated chemotherapy cycles, this factory comes close to shutting down for a while. Then you get anemia from a shortage of red blood cells, and bleeding does not stop well from a shortage of platelets. When the hemoglobin level drops below 7 to 8, or when you are dizzy and short of breath to the point that daily life is hard, you get a red blood cell transfusion. Platelets are usually given when they plunge to around 10,000, or when there is bleeding or a procedure ahead. In other words, it is not decided mechanically from a single number — they decide by weighing your current symptoms and what procedure is scheduled soon, all together.
A transfusion is usually given slowly over one to two hours while you lie in bed. One pack of red blood cells takes two to three hours, while platelets tend to finish faster. The nurse looks in often while you receive it, and this is not for nothing. The first ten-some minutes are the most important. If you suddenly get chills or a fever, feel itchy or break out in hives, or feel your chest tighten and your breathing quicken, you must report it right away. Most are mild reactions that quickly settle with medication, but rarely there is a severe reaction where blood pressure drops, which is why they watch closely at the start. Even if it is just "a bit cold," do not hold back — speak up.
Even after it is done, it helps to watch your body's signals for a few days. If you get a fever, if your urine turns darker than usual, or if you feel short of breath and swollen, those are things to report to the hospital. Meanwhile, if you receive transfusions often, the buildup of iron in the body becomes a concern too, but this is something the care team checks with regular tests, so rather than worrying about it alone, ask about it at your outpatient visit. And something surprisingly many people get confused about: the red blood cells brought in by transfusion do not stay forever — over time they reach the end of their lifespan. That is why you sometimes get another transfusion in line with your treatment cycle, and this is not a sign that things are getting worse.
One thing to add: receiving a transfusion plays the role of a bridge that buys time for the bone marrow to recover. While you endure chemotherapy, it briefly lends a hand so you do not get too worn out and do not become endangered by bleeding. So please do not take "I even needed a transfusion" to mean "my condition is critical." The fastest and most accurate way is to ask your care team whatever you are curious about at the time. This article is only a general explanation to aid understanding, so please be sure to discuss your own treatment plan with your attending physician.