 In hematologic patients with invasive aspergillosis, the galactomannan test can make the diagnosis in a noninvasive way.False-positive "Aspergillus" galactomannan tests have been found in patients on intravenous treatment with some antibiotics or fluids containing gluconate or citric acid such as some transfusion platelets, parenteral nutrition, or PlasmaLyte.On microscopy, "Aspergillus" species are reliably demonstrated by silver stains, e.g., Gridley stain or Gomori methenamine-silver.