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Thanks for the question and coming here. I would like to say that LDH is non-specific for cancer. High LDH cannot predict Lymphoma or cancer on its own. High LDH is mostly indicative of muscle breakdown and it can be elevated in mostly liver disease, hemolytic anemia, muscular breakdown, pancreatitis, heart disease, infection and others like that. It can also rise in lymphoma BUT not very common and most common reasons to rule out first. It seems that most likely in your father's case its due to infection. Please relax and I wish your father best of luck for biopsy results.
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Best wishesDr. Amir Javed