EnviroTOX Complete + Metals

Mercury exists in elemental, inorganic, and organic (methylmercury) forms. Urinary mercury primarily reflects inorganic mercury and elemental mercury vapour exposure; methylmercury from fish is predominantly excreted in faeces, so urine mercury is less sensitive for dietary methylmercury but useful for dental amalgam vapour and occupational exposure. Renal excretion is the main route for inorganic mercury, with a biological half-life of weeks to months.

Urinary mercury is the biomarker of choice for chronic elemental or inorganic mercury exposure. Elevations may arise from dental amalgam, occupational exposure (mining, manufacturing, dentistry), or contaminated water. Symptoms of chronic toxicity include tremor, cognitive impairment, and renal tubular dysfunction. Provocation testing with chelators is not recommended for diagnosis outside controlled research.

Lead is a non-essential metal that accumulates in bone and soft tissues. Urinary lead reflects recent exposure and is a less sensitive marker of body burden than blood lead, which integrates circulating and recent bone-release lead. Urine lead may be useful in monitoring chelation therapy or when blood sampling is impractical, though blood lead remains the standard screening tool.

Elevated urinary lead suggests recent or ongoing exposure from occupational sources (battery manufacturing, construction, lead paint removal), contaminated water, pottery glazes, or folk remedies. Chronic lead toxicity manifests as anaemia, peripheral neuropathy, cognitive effects, and renal impairment. Children are especially vulnerable. Chelation decisions are guided by blood lead, not urine lead alone.

Cadmium is a toxic metal with a biological half-life measured in decades, accumulating in the kidney and liver. Urinary cadmium correlates with long-term body burden and renal cortex concentration, making it the preferred biomarker for chronic exposure assessment. Smoking is the dominant source in the general population; occupational exposure occurs in metal smelting, battery production, and pigment manufacturing.

Elevated urinary cadmium reflects cumulative exposure and is associated with renal tubular dysfunction (including Fanconi syndrome and reduced glomerular filtration), bone demineralisation (itai-itai disease), and increased cancer risk. Because cadmium is not effectively chelated, management focuses on exposure cessation and monitoring of renal and bone health.

Arsenic exists in organic (arsenobetaine, arsenocholine from seafood) and inorganic forms. Inorganic arsenic and its methylated metabolites (monomethylarsonic acid, dimethylarsinic acid) are toxic; arsenobetaine is non-toxic and rapidly excreted. Speciated analysis separates toxic from non-toxic forms. Urinary excretion is the primary route, with a half-life of days for inorganic arsenic.

Total urinary arsenic can be elevated after seafood consumption without toxicity; speciation is essential to identify inorganic arsenic exposure from contaminated groundwater, occupational sources (smelting, pesticides, wood preservatives), or folk remedies. Chronic inorganic arsenic toxicity causes skin lesions, peripheral neuropathy, and increased risk of bladder, lung, and skin cancers. This panel should include speciation or be interpreted with dietary history.

Aluminium is ubiquitous in the environment, and low-level exposure through food, water, and antacids is common. Urinary aluminium reflects recent intake and renal excretion; blood aluminium is the preferred marker in dialysis patients at risk of aluminium-related bone disease. Absorption is low in healthy individuals but increases in those with renal impairment or taking citrate.

Elevated urinary aluminium may be seen with antacid use, occupational exposure (welding, manufacturing), or contaminated dialysate. Aluminium toxicity is rare in those with normal renal function but causes encephalopathy and osteomalacia in dialysis patients. The clinical significance of moderately elevated urine aluminium in non-dialysis populations is contested and should be interpreted with caution.

Antimony is used in flame retardants, batteries, and alloys. Urinary excretion is the main elimination route for absorbed antimony. Exposure in the general population is typically low; occupational exposure occurs in mining, smelting, and manufacturing.

Elevated urinary antimony suggests occupational or environmental exposure. Acute antimony toxicity resembles arsenic poisoning (gastrointestinal and cardiac effects); chronic exposure may cause respiratory irritation and dermatitis. Clinical significance of low-level elevations in non-occupational settings is uncertain.

Barium is encountered in drilling fluids, fireworks, and medical contrast agents (barium sulphate, which is poorly absorbed). Soluble barium salts can be toxic, blocking potassium channels and causing hypokalaemia, muscle weakness, and cardiac arrhythmias. Urinary barium reflects recent soluble-barium exposure.

Elevated urinary barium outside the context of medical contrast suggests ingestion or occupational exposure. Acute soluble-barium poisoning is a medical emergency; chronic low-level elevations are uncommon and of uncertain clinical significance in asymptomatic individuals.

Caesium is an alkali metal that follows potassium biochemically. Stable (non-radioactive) caesium exposure is ubiquitous at low levels; urinary excretion mirrors intake. Radioactive isotopes (e.g., Cs-137) are a concern after nuclear incidents, but this test measures stable caesium.

Stable caesium toxicity is rare. Elevated urinary caesium may be seen with contaminated water or occupational exposure. Some functional-medicine literature links caesium to cardiac effects, but evidence is limited and contested. Interpret elevations in clinical and exposure context.

Nickel is an essential trace element at very low levels and a common contact allergen. Urinary nickel reflects recent exposure; dietary sources (grains, legumes, chocolate) and occupational exposure (electroplating, welding, alloy production) contribute. Nickel is rapidly excreted in urine.

Elevated urinary nickel suggests increased intake or occupational exposure. Nickel hypersensitivity (contact dermatitis) is common but is a cell-mediated allergic response, not dependent on systemic nickel load. Systemic nickel allergy syndrome is debated. Interpret elevations with occupational and dietary history.

Platinum exposure in the general population is negligible. Occupational exposure occurs in refining and catalyst production; medical exposure arises from platinum-containing chemotherapy (cisplatin, carboplatin), which is nephrotoxic and ototoxic. Urinary platinum reflects recent exposure.

Elevated urinary platinum outside chemotherapy or occupational settings is unusual. In patients receiving platinum chemotherapy, urinary platinum is monitored as part of toxicity assessment but is not used to guide dosing.

Thallium is a highly toxic metal once used in rodenticides and now encountered in industrial processes, electronics, and optics. Thallium is absorbed through the gastrointestinal tract and skin and distributes widely. Urinary excretion is a major route; thallium has a half-life of weeks.

Thallium poisoning presents with alopecia, painful peripheral neuropathy, and gastrointestinal symptoms. Acute poisoning is rare but serious, often from intentional poisoning or accidental ingestion. Urinary thallium is the primary diagnostic biomarker. Prussian blue enhances faecal excretion and is the treatment of choice.

Tin exists as inorganic tin (low toxicity) and organotin compounds (tributyltin, used in antifouling paints, is highly toxic). Urinary tin reflects recent exposure; inorganic tin from food (canned goods) is poorly absorbed and excreted rapidly.

Elevated urinary tin is typically from dietary sources and is of low concern. Organotin exposure (occupational or environmental contamination) is neurotoxic and immunotoxic, but most urine assays do not speciate. Interpret elevations with exposure and symptom context.

Tungsten is used in alloys, electronics, and military applications. Dietary exposure is low; occupational exposure occurs in mining and manufacturing. Urinary tungsten reflects recent exposure.

Tungsten toxicity is rare. Elevated urinary tungsten may be seen with occupational exposure or contaminated water. Animal studies suggest potential pulmonary and reproductive effects, but human data are limited. Interpret in exposure context.

Uranium is a naturally occurring radioactive metal; exposure is primarily from contaminated groundwater in certain regions, occupational sources (mining, nuclear industry), or military use (depleted uranium). Urinary uranium is the primary biomarker for internal contamination; uranium is nephrotoxic, and kidneys are the critical organ for chemical (not radiological) toxicity at typical exposure levels.

Elevated urinary uranium indicates internal exposure; nephrotoxicity manifests as proximal tubular dysfunction. Radiological risk is low except in very high exposures. Uranium exposure is assessed in populations near mining sites and in military personnel exposed to depleted uranium.

Creatinine is a breakdown product of creatine phosphate in muscle, excreted in urine at a relatively constant rate. Urinary creatinine is used to normalise spot urine concentrations of analytes (expressed as µg/g creatinine) to account for urine dilution or concentration, though it is imperfect in very dilute (<20 mg/dL) or very concentrated (>300 mg/dL) samples.

Creatinine correction improves comparability of spot urine metal levels. Very low creatinine suggests over-hydration or collection error; very high creatinine suggests dehydration or incomplete mixing. Some laboratories flag samples outside 20–300 mg/dL as unsuitable for creatinine-corrected reporting.