Identifying the False Statement in Haemolytic Uraemic Syndrome (HUS)

Haemolytic Uraemic Syndrome (HUS) is a serious condition characterized by a combination of symptoms. Let's evaluate each statement to find the one that is not true:

Analyzing HUS Characteristics

• Statement 1: It is a microangiopathic haemolytic anaemia. This statement is true. HUS involves the destruction of red blood cells (haemolytic anaemia) due to damage in small blood vessels (microangiopathy).
• Statement 2: Thrombocytopenia and schistocytes are seen in the peripheral blood smear. This statement is true. Microvascular damage leads to low platelet counts (thrombocytopenia) and fragmented red blood cells (schistocytes) are visible on blood smear analysis.
• Statement 3: Renal insufficiency is a complication. This statement is true. Kidney damage, leading to renal insufficiency or failure, is a primary and severe complication of HUS.
• Statement 4: Direct Coombs' test is positive. This statement is not true. HUS is caused by mechanical damage to red blood cells, not by antibodies attacking them. Therefore, the Direct Coombs' test, which detects antibody coating on red blood cells, is typically negative in HUS.

Conclusion on HUS Diagnosis

The defining feature of HUS includes microangiopathic haemolytic anaemia, thrombocytopenia, and often renal failure. The absence of antibody attachment to red blood cells differentiates it from immune-mediated haemolytic anaemias, making the Direct Coombs' test negative.

Therefore, the statement that the Direct Coombs' test is positive is incorrect regarding Haemolytic Uraemic Syndrome.