PTGDS and medium chain acyl-CoA dehydrogenase deficiency: Nevertheless, median AA-triggered PGD2 level for MCAD patients were significantly higher (median: 964 pg/ml; P < 0.001) than for healthy controls (median: 180 pg/ml; range: 144–473 pg/ml), however with high variance (range: 236–1818 pg/ml).