Is there a diagnostic laboratory test for Kawasaki Disease?
No, there is no diagnostic laboratory test for KD. KD remains a clinical diagnosis. Laboratory tests show the findings of acute inflammation including elevated ESR, CRP, leukocytes, and platelet count. The platelet count typically rises after the 7th day of illness and may exceed 10 6 /mm 3 . Any patient who develops thrombocytopenia, elevated liver-associated enzymes, high triglycerides, and extremely elevated ferritin levels should be evaluated for MAS.