GPT and lymphopenia: In their systematic review, they also found that lymphopenia, thrombocytopenia, and elevated levels of D-dimer, procalcitonin (PCT), lactate dehydrogenase (LDH), alanine aminotransferase (ALT), aspartate aminotransferase (AST), and creatinine kinase (CK) were also associated with poor outcomes in hospitalized patients.