Overview: Lactate Dehydrogenase Fluid TestIntroduction: The Lactate Dehydrogenase Fluid Test measures LDH in body fluids to diagnose infections or malignancies, causing swelling or pain. Following 2023 ASCP guidelines, it uses biochemical methods for high specificity, supporting cancer screening. This test is critical for guiding diagnosis, treatment planning, and improving outcomes in biochemistry for patients with suspected infections or malignancies.
Other Names: LDH Fluid Assay, Fluid Malignancy Test.
FDA Status: Laboratory-developed test (LDT), meeting biochemistry standards for diagnostic accuracy.
Historical Milestone: LDH fluid testing began in the 1970s with cancer research. Biochemical methods improved in the 2000s, enhancing diagnostic precision.
Purpose: Measures LDH in fluid to diagnose infections or malignancies, guides treatment, and evaluates patients with swelling or pain.
Test Parameters: 1. Lactate Dehydrogenase (Fluid)
Pretest Condition: No fasting required. Collect body fluid, CSF, pleural, or peritoneal fluid. Report history of swelling, pain, or infection symptoms.
Specimen: Body Fluid (sterile container, 5-10 mL), CSF (sterile container, 1-2 mL), Pleural Fluid (sterile container, 5-10 mL), Peritoneal Fluid (sterile container, 5-10 mL). Transport in a biohazard container.
Sample Stability at Room Temperature: 8 hours
Sample Stability at Refrigeration: 7 days
Sample Stability at Frozen: 6 months
Medical History: Document swelling, pain, fever, or history of malignancies. Include current medications, especially chemotherapy.
Consent: Written consent required, detailing the tests purpose, malignancy implications, and risks of fluid collection.
Procedural Considerations: Uses biochemical methods to measure LDH in body fluids. Results are available in 1-2 days, supporting rapid clinical decisions. Performed in laboratories, often for infection or malignancy diagnosis.
Factors Affecting Result Accuracy: Hemolysis, contamination, or improper sample storage can affect results. Insufficient sample volume may reduce accuracy.
Clinical Significance: Elevated LDH in fluids suggests infections or malignancies (e.g., lymphoma), guiding treatment. Normal levels may require further testing.
Specialist Consultation: Consult an oncologist or infectious disease specialist for result interpretation and treatment planning.
Additional Supporting Tests: Fluid cytology, CEA, or PET-CT to confirm malignancy or infection diagnosis.
Test Limitations: Not specific to one condition; other inflammatory states may elevate LDH. Clinical correlation is needed.
References: ASCP Biochemistry Guidelines, 2023; American Journal of Clinical Pathology, Drachman D, 2022.
