Table 4.

Mississippi and Tennessee systems for diagnosis of HELLP syndrome

Mississippi system	Tennessee system
Class 1 (severe): AST or ALT > 70 U/L LDH > 600 U/L Platelets < 50 × 109 /L Class 2 (moderate): AST or ALT > 70 U/L LDH > 600 U/L Platelets 50–100 × 109 /L Class 3 (mild) AST or ALT > 40 U/L LDH > 600 U/L Platelets 100–150 × 109 /L	AST > 70 U/L LDH > 600 U/L Platelets < 100 × 109 /L Complete HELLP syndrome: all three criteria met Partial HELLP syndrome: 1–2 criteria met

ALT, alanine aminotransferase; AST, aspartate aminotransferase; HELLP, haemolysis, elevated liver enzymes, low platelets; LDH, lactate dehydrogenase.