What should you know about haemolytic crisis in sickle cell disease?

Red blood cells carry oxygen. During haemolysis, they are destroyed faster than usual, which can reduce oxygen delivery and leave the body short of healthy cells. Possible features include new or worsening Fatigue, Pale Skin, yellowing of the eyes, dark urine, dizziness, fast heartbeat, breathlessness, or Joint Pain. A crisis may occur alongside infection, dehydration, cold exposure, or other stress, but the trigger is not always obvious. It is different from a pain crisis, although the two can occur together.

Follow the emergency plan provided by your sickle-cell team and contact them promptly if symptoms suggest haemolysis. Keep drinking fluids if you can swallow safely, avoid strenuous activity, and take only medicines included in your care plan. Bring your medication list and previous blood results if available. Medical assessment may include a Blood Test and checks of oxygen levels, urine, infection, and heart rate. Do not wait for a routine appointment when symptoms are new or rapidly worsening.

Seek emergency help for severe breathlessness, chest pain, fainting, confusion, extreme weakness, a very fast heartbeat, or inability to drink. Fever, sudden severe headache, one-sided weakness, or a painful swollen limb also needs urgent assessment. Children with unusual sleepiness, poor feeding, or breathing difficulty should be assessed immediately. Tell the receiving team that you have sickle cell disease and may be experiencing haemolysis.

Which symptoms in my case suggest haemolysis rather than a pain crisis? What should my emergency plan say? How often should my blood counts be checked, and which treatments or infections could trigger a rapid fall in red blood cells?