Medically reviewed by Steffini Stalos, DO LDH is a blood test that measures the amount of lactate dehydrogenase (LDH), an enzyme, in your blood. Chemically, LDH works to convert pyruvate to ...

DEAR DR. ROACH: What is your opinion on the new Galleri blood test that can help detect cancers for which there are no early screening? Like many people my age (66), I’ve known too many people ...