My muscle biopsy showed mild fat storage in the cell. My free carnitine is low and lactate in the 24h urine collection is higher. What is my problem?

NOT ENOUGH INFORMATI. We do not know your history as to why the muscle biopsy and carnitine levels were done.Carnitine deficiency can be genetic called SPCDorSystemic PrimaryCartDeficiency inborn error of fatty transport.It can cause muscle weakness,Cardiomyopathy,hypoglycemia and Liver Dysfunction.Acute episodes usualy follow fasting,vomiting or infections.It is more common in Faroe ISLAND(Danish) Need Echocardiogram.