Overview: Lactate Plasma TestIntroduction: The Lactate Plasma Test measures lactate in plasma to diagnose metabolic disorders or shock, causing fatigue or rapid breathing. Following 2023 SCCM guidelines, it uses biochemical methods for high specificity, supporting metabolic screening. This test is critical for guiding diagnosis, treatment planning, and improving outcomes in biochemistry for patients with suspected metabolic or critical conditions.
Other Names: Plasma Lactate Assay, Metabolic Lactate Test.
FDA Status: Laboratory-developed test (LDT), meeting biochemistry standards for diagnostic accuracy.
Historical Milestone: Plasma lactate testing began in the 1970s with critical care research. Biochemical methods improved in the 2000s, enhancing diagnostic precision.
Purpose: Measures lactate in plasma to diagnose metabolic disorders or shock, guides treatment, and evaluates patients with fatigue or rapid breathing.
Test Parameters: 1. Lactate (Plasma)
Pretest Condition: No fasting required. Collect plasma. Report history of fatigue, rapid breathing, or shock symptoms.
Specimen: Plasma (NaF, 2-4 mL). Transport in a biohazard container.
Sample Stability at Room Temperature: 24 hours
Sample Stability at Refrigeration: 5 days
Sample Stability at Frozen: Not frozen
Medical History: Document fatigue, rapid breathing, shock, or history of metabolic disorders. Include current medications, especially vasopressors.
Consent: Written consent required, detailing the tests purpose, metabolic implications, and risks of blood collection.
Procedural Considerations: Uses biochemical methods to measure lactate in plasma. Results are available in 1-2 days, supporting rapid clinical decisions. Performed in laboratories, often for metabolic or shock diagnosis.
Factors Affecting Result Accuracy: Hemolysis, delayed processing, or improper sample storage can affect results. Incorrect anticoagulant may reduce accuracy.
Clinical Significance: Elevated plasma lactate suggests lactic acidosis or shock, guiding fluid resuscitation or metabolic therapy. Normal levels may require further testing.
Specialist Consultation: Consult a critical care specialist or endocrinologist for result interpretation and treatment planning.
Additional Supporting Tests: Arterial blood gas, serum bicarbonate, or anion gap to confirm metabolic disorder diagnosis.
Test Limitations: Not specific to one condition; exercise or hypoxia may elevate lactate. Clinical correlation is needed.
References: SCCM Critical Care Guidelines, 2023; Critical Care Medicine, Vincent JL, 2022.
