Lactate Dehyderogenase LDH - Any Fluid
Also Known As
Test Parameters Included
- Lactate Dehydrogenase (LDH) Enzyme Concentration (U/L) - quantitative measurement in any body fluid
- Pathologist Clinical Biochemistry Remark - interpreted in context of fluid type and clinical presentation
Department
Methodology
Sample Required
Preparation
Schedule Report
24 Hours
Emergency Report
Yes
Frequently Asked Questions
What does LDH in body fluid indicate?
Elevated LDH in any body fluid signals cell damage or turnover at that site. It is commonly used to differentiate exudative from transudative effusions in pleural, pericardial, or ascitic fluids.
Which fluids can be tested for LDH?
LDH can be measured in pleural fluid, ascitic fluid, cerebrospinal fluid (CSF), pericardial fluid, synovial fluid, and peritoneal dialysate. The clinical significance varies by fluid type.
Why is LDH used in Light's criteria?
LDH helps classify pleural or pericardial effusions. An exudate is suggested when fluid LDH exceeds two-thirds the upper limit of normal serum LDH, indicating inflammation, infection, or malignancy.
Is fasting required for this test?
No, fasting is not required. The test is performed on the collected body fluid sample, and dietary intake does not affect fluid LDH levels.
How is the sample collected?
The sample is obtained via diagnostic aspiration or drainage — such as thoracentesis, paracentesis, lumbar puncture, or arthrocentesis — depending on the body cavity involved. It is sent in a sterile container to the lab.
What causes high LDH in CSF?
Elevated CSF LDH is seen in bacterial or tubercular meningitis, subarachnoid hemorrhage, and CNS malignancies. It reflects increased neuronal or glial cell damage and is often higher in bacterial than viral meningitis.
Test Description
Test Code
L07
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