Diagnosing aHUS

Diagnosing aHUS

There is no definitive test for aHUS – a diagnosis is usually made by performing certain blood tests and ruling out other similar conditions.

Common tests will include:

  • Full blood count – this is to look at the level of platelets and haemoglobin (red blood cells) in your blood
  • Urea & Electrolytes – this assesses your kidney function
  • Lactate Dehydrogenase (LDH) – this can be raised during an episode of aHUS due to the breakdown of red blood cells
  • Haptoglobins – these can be low during an episode of aHUS as haptoglobins attach to the haemoglobin released when red blood cells break down
  • Complement studies – to measure the levels of complement proteins (C3, C4) and protector proteins (Factor H, Factor I & CD46) in your blood
  • Genetic testing – to see if you carry any of the known genetic faults associated with aHUS
  • Blood film – this examines your blood cells under a microscope to look for broken or damaged cells
  • ADAMTS13 – an enzyme that is reduced in the haematological disease TTP, this test is used to exclude TTP
  • Stool / rectal swab – to exclude ‘typical’ HUS, also known as STEC HUS, E-Coli HUS or diarrhoea positive HUS
  • Urinalysis – looks for evidence of blood and protein in your urine that can indicate kidney damage
  • Ultrasound – a non-invasive scan that provides a general outline of the size and shape of your kidneys
  • Biopsy – a small piece of kidney tissue is removed and looked at under a microscope. This provides a more accurate picture of what may be causing the damage to the kidney
  • ECG and/or echocardiogram – to look for evidence of long-term high blood pressure that might cause kidney damage

In addition there are a number of other tests that may be carried out to exclude other diseases that present in a similar way. Your local team can provide an explanation of these if required.

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