Liver Function Test Results Correlate With Spleen Size in Patients With Infectious Mononucleosis.

Abstract

We aimed to evaluate the efficacy of measuring transaminase levels to determine the resolution of splenomegaly in athletes diagnosed with infectious mononucleosis (IM). Wecollected serial aspartate aminotransferase (AST) and alanine transaminase (ALT) levelsand ultrasound-measured spleen sizes in university athletes who had been diagnosed with IM. Our study included seven university-aged athletes from a single institution. Patients received serial liver function tests (LFT) and splenic ultrasound testing until resolution of symptoms and full return to sport. The effects of AST, ALT, and days from symptom onset were analyzed using multivariable mixed-effects linear regression models. Levels of AST and ALT were significantly correlated with spleen size. For each 10-unit increase in AST and ALT values, spleen size increased by 0.1 cm (p = 0.007) and 0.09 cm (p = 0.008), respectively. Decreasing levels of ALT and AST correlated with a decrease in spleen size. Normalization of AST/ALT values correlated with return of spleen size to baseline. Liver function testing may be useful in the return-to-play decision-making process for athletes with IM.