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A lactate dehydrogenase (LDH) test usually measures the level of lactate dehydrogenase (LDH) in a sample of your blood. In certain cases, LDH levels are measured in samples of other body fluids. This includes testing fluid from the spine ( cerebrospinal fluid ), the belly ( peritoneal fluid ), and the chest ( pleural fluid ).

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Lactate Test

This test measures the level of lactate, also called lactic acid, in a sample of your blood. In certain cases, cerebrospinal fluid (CSF) may be used. Normally, you have low levels of lactate in your blood and CSF. High levels of lactate may be a sign of a wide variety of medical conditions.

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Lyme Disease Tests

Lyme disease is an infection caused by bacteria you get from tick bites . Lyme disease tests look for signs of infection in a sample of your blood or cerebrospinal fluid (CSF). CSF is a clear liquid that flows in and around your brain and spinal cord. The test checks your sample for antibodies that your immune system makes to fight the bacteria that cause Lyme disease.

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Meningococcal Disease Tests

Meningococcal disease is the name for any infection caused by meningococcal bacteria (called Neisseria meningitidis ). Meningococcal disease tests look for these bacteria in your blood or cerebrospinal fluid (CSF), the fluid in spaces around your brain and spinal cord.

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Article

Metagenomic next-generation sequencing of cerebrospinal fluid reveals pathogen spectrum and mortality predictors among patients with advanced HIV-1 disease at a tertiary hospital in China.

Research record from Virol J, 2026-06-29. PMID 42374552.

Article

Molecular evidence of neuroinvasive Sindbis virus infection in humans: detection in cerebrospinal fluid by next generation sequencing.

Research record from Emerg Microbes Infect, 2026-07-23. PMID 42434987.

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