Overview: Cadmium Test (Blood)Introduction: The Cadmium Test (Blood) measures cadmium levels in blood to detect poisoning, causing kidney damage or bone pain. Following 2023 ATSDR guidelines, it uses chromatography for high sensitivity, aiding in toxin screening. This test is critical for guiding diagnosis, treatment, and improving outcomes in toxicology for patients with suspected cadmium exposure.
Other Names: Cadmium Blood Assay, Heavy Metal Toxicity Test.
FDA Status: Laboratory-developed test (LDT), meeting toxicology standards for diagnostic accuracy.
Historical Milestone: Cadmium testing began in the 1970s with environmental health studies. Blood-based assays emerged in the 1980s, and by the 2000s, chromatography improved detection accuracy.
Purpose: Diagnoses cadmium poisoning, guides treatment, and monitors exposure in patients with kidney damage or bone pain.
Test Parameters: 1. Cadmium
Pretest Condition: No fasting required. Collect whole blood, serum, or plasma at any time. Report symptoms like kidney dysfunction or bone pain, and list exposure sources.
Specimen: 2-5 mL whole blood (EDTA), 2-5 mL serum (SST), or 2-4 mL plasma (EDTA). Transport in a biohazard bag within 24 hours.
Sample Stability at Room Temperature: 24 hours
Sample Stability at Refrigeration: 48 hours
Sample Stability at Frozen: Not frozen
Medical History: Document kidney issues, bone pain, or occupational/environmental exposure. Include current medications, especially chelating agents.
Consent: Written consent required, detailing the tests purpose, implications for toxicity treatment, and potential need for chelation therapy.
Procedural Considerations: Uses chromatography (e.g., ICP-MS) to measure cadmium levels. Results are available in 1-2 days, supporting rapid clinical decisions.
Factors Affecting Result Accuracy: Contamination or improper storage can affect results. Recent exposure may not yet elevate blood levels.
Clinical Significance: Elevated cadmium levels confirm acute poisoning, prompting chelation therapy. Normal levels may require urine testing for chronic exposure.
Specialist Consultation: Consult a toxicologist for result interpretation. A nephrologist referral is advised for kidney damage cases.
Additional Supporting Tests: 24-hour urine cadmium test, kidney function tests, or bone density scan to confirm toxicity or assess organ damage.
Test Limitations: Blood levels reflect recent exposure; chronic exposure requires urine testing. Results require clinical correlation.
References: ATSDR Cadmium Guidelines, 2023; Environmental Health Perspectives, Nawrot TS, 2022.
