Why is smoking status important when interpreting blood cadmium?

Tobacco is the dominant non-occupational source of cadmium; smokers typically have blood levels two to three times higher than non-smokers. Reference ranges and risk thresholds differ accordingly, so smoking history is essential to accurate interpretation.

Is fasting required for a blood cadmium test?

No, fasting is not required. However, a detailed dietary history—particularly recent consumption of shellfish, rice, or organ meats—and smoking history in the 48 hours before the draw aids interpretation.

How is the specimen collected to prevent contamination?

Blood must be drawn into certified trace-element-free tubes (royal blue top) using powder-free gloves at a clean venepuncture site. Standard blood-collection tubes can introduce external cadmium contamination and invalidate the result.

What occupations have the highest risk of cadmium exposure?

Workers in battery manufacture, metal smelting and refining, electroplating, pigment production, and plastic stabiliser industries face the highest occupational exposure. Welding, soldering, and waste incineration are additional sources.

Can a normal blood cadmium rule out chronic toxicity?

No. Blood cadmium reflects recent exposure; individuals removed from exposure for months or years may have normal blood levels yet retain high kidney cadmium and ongoing tubular damage. Urinary cadmium and renal biomarkers (beta-2 microglobulin) are needed to assess chronic toxicity.

How long does it take to get blood cadmium results?

Results are typically available within 3–5 business days from specimen receipt at Quest, as inductively coupled plasma mass spectrometry is a batch send-out assay at most laboratories.

What dietary sources contribute to cadmium exposure?

Rice grown in contaminated paddy fields, shellfish (particularly the hepatopancreas), leafy vegetables from polluted soil, and organ meats (kidney, liver) are the main dietary contributors. Habitual consumption can raise both blood and urinary cadmium.

BML-HMT-012heavy metals toxicologyUSA

Cadmium, Blood

The blood cadmium test measures whole-blood cadmium by ICP-MS to assess recent or ongoing exposure over weeks to months. It is the preferred marker for evaluating current occupational or tobacco exposure, screening for nephrotoxic and carcinogenic risk, and monitoring intervention success, interpreted alongside urinary cadmium for cumulative body burden.

Biomarkers

Blood (whole blood)

Sample

3–5 business days

Turnaround

Fasting

What is the Blood Cadmium test?

The Blood Cadmium test quantifies whole-blood cadmium concentration by inductively coupled plasma mass spectrometry, the reference method for trace-metal analysis. It is ordered to assess recent or ongoing cadmium exposure in patients with a history of tobacco use, occupational exposure, or residence near industrial sources, and to investigate unexplained renal tubular dysfunction or bone demineralisation that might reflect chronic toxicity. Blood cadmium is the acute-exposure biomarker: it rises and falls more quickly than urinary cadmium, making it the preferred test when recent exposure—such as a workplace incident or a new smoking habit—is suspected. Practitioners pair blood and urine cadmium when both recent exposure and cumulative body burden need evaluation, and serial blood measurements track the effectiveness of exposure-reduction interventions over weeks to months.

What does the Blood Cadmium test measure?

Cd(Cadmium, Blood)

Range: Non-smokers typically <1.0 µg/L; smokers 1.0–5.0 µg/L. Levels >5.0 µg/L warrant clinical concern.Optimal: For non-occupationally exposed non-smokers, a blood cadmium concentration below 0.5 µg/L is considered low-risk; levels above 1.0 µg/L, even in the absence of symptoms, warrant environmental and occupational review.µg/L / nmol/L

Cadmium is a nephrotoxic and carcinogenic heavy metal with no known physiological role. Exposure occurs chiefly through tobacco smoke, occupational inhalation (smelting, battery manufacture, pigment industries), and dietary intake from contaminated crops grown in polluted soil. Once absorbed, cadmium binds to metallothionein and accumulates slowly in the kidneys and liver, with a biological half-life measured in decades. Blood cadmium reflects recent or ongoing exposure—typically over the preceding few months—whereas urinary cadmium correlates better with total body burden and chronic tissue accumulation.

Blood cadmium is the marker of choice for assessing recent or current exposure, particularly in smokers and workers in at-risk industries. Chronic cadmium exposure causes proximal renal tubular dysfunction (Fanconi syndrome), osteomalacia through renal phosphate wasting and impaired vitamin D metabolism, and has been classified as a human carcinogen (lung, prostate). Blood levels guide the need for source identification, workplace intervention, and serial renal monitoring.

Why is the Blood Cadmium test ordered?

Investigation of suspected occupational cadmium exposure in workers in battery manufacture, metal smelting, electroplating, or pigment production
Screening and monitoring of current smokers, for whom tobacco is the dominant non-occupational source of cadmium
Work-up of unexplained proximal renal tubular dysfunction, Fanconi syndrome, or low-molecular-weight proteinuria (beta-2 microglobulin, retinol-binding protein)
Evaluation of patients with osteomalacia or increased fracture risk when dietary or environmental cadmium exposure is plausible
Assessment of individuals living near industrial sites, waste incinerators, or smelters with known cadmium emissions
Serial monitoring following removal from exposure to document declining blood levels and confirm intervention success
Pre-placement and periodic surveillance testing in occupational-health programmes where cadmium is a regulated hazard
Investigation of multi-metal exposure in patients presenting with signs of chronic heavy-metal toxicity

Sample collection and turnaround

Sample type

Blood (whole blood)

Fasting required

Collection method

Venipuncture at patient service centre

Turnaround

3–5 business days

Collection notes

Phlebotomy at Quest Diagnostics patient service centre using certified trace-element-free royal-blue-top (EDTA or heparin) tubes to prevent external contamination. Standard venepuncture technique; avoid powdered gloves and ensure the draw site is free of dust. No fasting required, though a detailed dietary history (shellfish, rice, organ meats) and smoking history in the 48 hours before collection aids interpretation.

Specimen requirements

Minimum 3 mL whole blood in trace-element-free tube (royal blue top). Mix gently by inversion; do not shake. Ship refrigerated or frozen per laboratory protocol. Specimen must be free of haemolysis and external contamination; reject if collected in standard tubes not certified for trace metals.

What can affect Blood Cadmium results?

elevatesTobacco smoking

Tobacco leaves bioaccumulate cadmium; smoking one pack per day can double or triple blood cadmium compared with non-smokers, making smoking history essential to interpretation.

elevatesDietary intake of contaminated rice, shellfish, or organ meats

Cadmium accumulates in rice grown in polluted paddy fields and in the hepatopancreas of shellfish; habitual consumption raises both blood and urinary levels.

variableTiming relative to last exposure

Blood cadmium reflects exposure over recent weeks to months, so a single result may miss intermittent or past exposure; urinary cadmium is more stable and integrates longer-term burden.

elevatesExternal contamination of specimen

Cadmium is ubiquitous in the environment; collection must use trace-element-free tubes and avoid contamination from dust, gloves, or surfaces to prevent spuriously elevated results.

variableRenal impairment

Advanced chronic kidney disease alters cadmium kinetics, potentially lowering urinary excretion while blood levels may remain stable or rise; interpret alongside estimated GFR and urinary metals.

elevatesRecent shellfish meal

A single large serving of contaminated shellfish or organ meat can transiently raise blood cadmium for a few days, so dietary history in the 48 hours before the draw is relevant.

What do Blood Cadmium results mean?

Elevated

Blood cadmium above 1.0 µg/L in a non-smoker, or above 5.0 µg/L in any individual, indicates significant exposure and warrants environmental or occupational investigation. Persistently elevated levels are associated with proximal tubular nephropathy (low-molecular-weight proteinuria, glycosuria, aminoaciduria), impaired bone mineralisation, and increased long-term cancer risk. Source identification—occupational hygiene assessment, household evaluation, dietary review—is the first step, followed by serial monitoring to confirm declining levels after removal from exposure.

Normal

Blood cadmium in the reference range for the patient's smoking status indicates exposure consistent with background environmental and dietary intake. Serial results are more informative than a single value, particularly in occupational surveillance, and a normal blood level does not rule out chronic toxicity if urinary cadmium or renal biomarkers are abnormal.

Reduced

Low or undetectable blood cadmium is normal in individuals without occupational or heavy dietary exposure and indicates minimal recent intake. It does not, however, exclude past high exposure or accumulated tissue burden, for which urinary cadmium or historical records are more informative.

Note: Blood cadmium is a short-to-medium-term exposure marker; urinary cadmium better reflects cumulative body burden and chronic kidney accumulation. Interpretation must account for smoking status, occupational history, and dietary habits, and always compare results with reference ranges specific to the analysing laboratory and specimen type. Renal function and urinary biomarkers of tubular injury (beta-2 microglobulin, NAG) add essential clinical context.

Frequently asked questions

Blood cadmium reflects recent exposure over the preceding weeks to months, making it the marker of choice for acute or current exposure assessment. Urinary cadmium integrates decades of accumulation and correlates with total body burden and chronic kidney damage, so the two tests answer different clinical questions and are often ordered together.

How to access the Blood Cadmium test

The Blood Cadmium reference page is free and open to all practitioners. Create a free practitioner account to see pricing, save tests to your list, and generate requisition forms. Verification takes 1–2 business days.

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About this page

Published: October 7, 2026

Last reviewed: October 7, 2026

References:

Agency for Toxic Substances and Disease Registry (ATSDR). Toxicological profile for cadmium. (2012)
Järup L, Åkesson A. Current status of cadmium as an environmental health problem. Toxicol Appl Pharmacol. (2009)
ACGIH. Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) for cadmium. (2023)
Nordberg GF, et al. Cadmium and health in the 21st century — historical remarks and trends for the future. Biometals. (2022)
International Agency for Research on Cancer (IARC). Cadmium and cadmium compounds (Group 1 carcinogen). (2012)

This content is for licensed healthcare practitioners only and does not constitute medical advice. Clinical decisions should be based on the full clinical picture and not on any single test result.