Table.

Laboratory values in coronavirus disease 2019^58,59,106, 107, 108

Laboratory value	Direction in COVID-19	Meaning
White blood cell count	Any direction	If elevated, may point to bacterial source
Platelets	Low	Can be seen in many viral infections
Lymphocytes	Low	Can be seen in many viral infections
Liver functions (AST, ALT)	Mildly elevated	Can be seen in many viral infections
Procalcitonin	Low, Normal	If elevated, suggests bacterial source
Lactate dehydrogenase	Mildly elevated	Likely owing to mild liver injury
C-reactive Protein	Mildly elevated	Inflammatory marker, very elevated suggests poor prognosis or bacterial source
D-dimer	Elevated	Elevation suggests poor prognosis and may suggest thromboembolism
Ferritin	Elevated	Inflammatory marker, but very elevated thought to be more specific for COVID-19 and may suggest poor prognosis
Interleukin 6	Elevated	Elevated suggests very poor prognosis and may be an early indicator of ARDS

ARDS, acute respiratory distress syndrome; AST, aspartate transaminase; ALT, alanine transaminase; COVID-19, coronavirus disease.