Antimony 24 Hour Test

Antimony is a toxic metal you encounter without realizing it. It hides in flame retardants on furniture and clothing, in some plastics including certain water bottles, in alloys, paints, and industrial dust. Your body absorbs small amounts through air, food, water, and skin contact, then your kidneys work to flush it back out.

A 24-hour urine antimony test captures every drop of urine you produce over a full day, giving the most complete picture of how much antimony your body is currently processing. Levels that look low by clinical standards still track with measurable differences in heart disease risk, blood pressure, blood sugar control, and bone density across large population studies.

What This Test Actually Measures

Antimony (Sb) is an element with atomic number 51, used in flame retardants, plastics, alloys, pigments, and some older medications. Your body does not produce it. Every molecule of antimony in your urine arrived from somewhere in your environment.

Once inside, antimony accumulates in your liver, lungs, kidneys, intestines, spleen, and blood cells. Most of it leaves through urine and feces, with a half-life of roughly 24 to 95 hours depending on the chemical form. That short half-life is why this test reflects recent exposure rather than lifetime burden. A 24-hour collection smooths out the natural hour-to-hour variation in urine concentration and captures the total amount your kidneys cleared over a full day, which is generally considered more accurate than a single spot sample.

Heart Disease and Blood Pressure

The cardiovascular evidence is where antimony has drawn the most attention. In a Danish case-cohort study drawing on 19,394 never-smokers, higher urinary antimony was linked to increased risk of heart attack and heart failure, with stroke also examined. A Spanish follow-up study of 1,171 adults found that urinary antimony was one of the two most important components of a urinary metal mixture associated with new cardiovascular events, alongside cadmium.

A U.S. NHANES analysis of 14,305 adults found that higher urinary antimony was associated with increased all-cause and cardiovascular mortality. In a separate U.S. analysis of 7,781 adults, higher urinary antimony tracked with greater prevalence of congestive heart failure and prior heart attack. A community-based study of 3,081 adults found that mean platelet volume partially explained the link between urinary antimony and 10-year atherosclerotic cardiovascular disease risk.

For blood pressure specifically, NHANES data from 1999 to 2006 found that certain urinary metal mixtures that included higher antimony were linked to higher systolic and diastolic blood pressure in adults aged 20 to 60.

Blood Sugar and Diabetes Complications

Antimony shows up in metabolic studies as well. In an NHANES study of 751 adolescents aged 12 to 19, higher urinary antimony was linked to higher HbA1c (a three-month average of blood sugar), with the strongest signal in males. In a machine-learning analysis of people with diabetes, urinary antimony was identified as a key predictor of diabetic retinopathy, the eye damage that can lead to vision loss.

Bone Density

In a study of 380 postmenopausal Brazilian women, higher urinary antimony was independently linked to greater odds of osteoporosis and lower bone mineral density. The association held after adjusting for other metals and conventional risk factors.

Sleep, Cognition, and Aging Markers

NHANES data from 2,654 U.S. adults linked higher urinary antimony to insufficient sleep and obstructive sleep apnea. In 631 older U.S. adults, the relationship between urinary antimony and cognitive function was non-linear: lower exposure tracked with better performance, and higher exposure with possible cognitive decline. Higher urinary antimony has also been linked to shorter leukocyte telomere length, a marker of cellular aging, in NHANES data.

Pregnancy and Fetal Growth

A pooled analysis of three U.S. pregnancy cohorts found that higher maternal urinary antimony during pregnancy was linked to lower birth weight for gestational age. This places antimony alongside mercury and tin as metals worth tracking when planning or during pregnancy.

Reference Ranges

Antimony is a research and exposure-monitoring marker. There are no universally agreed clinical decision thresholds for population health risk, and lab-to-lab variation can be substantial. The values below come from a Swedish biobank study of 60 healthy non-smoking adults using 24-hour urine collections, and from German biomonitoring data on 2,250 children and adolescents. They are illustrative orientation only. Your lab will likely report results in different units, and what matters most is your trend over time within the same lab.

Source: Barregard et al. 2021 (Swedish biobank, 60 adults); Hahn et al. 2025 (GerES V, 2,250 children/adolescents). Compare your results within the same lab over time, not across labs or studies that use different methods and units.

Tracking Your Trend

One reading of urinary antimony is a snapshot of the past few days, not your long-term burden. The element's half-life is short, between roughly 24 and 95 hours, meaning today's level reflects this week's exposure more than last year's. A study using repeated urine samples in healthy adult men found that single measurements misclassified individuals; repeated specimens substantially improved the accuracy of exposure assessment for non-essential metals including antimony.

Get a baseline 24-hour collection. If the result is elevated, retest in 3 to 6 months after investigating likely sources, and at least annually thereafter if you want to track trend. If you change something concrete (new water filter, removed older flame-retardant furniture, changed workplace conditions), retest 6 to 12 weeks later to see if your exposure has actually fallen.

What to Do If Your Result Is Elevated

Elevated urinary antimony tells you about exposure, not damage. The first step is to find the source. Common sources include occupational exposure (firefighting, mining, plastics manufacturing, soldering, flame-retardant production), proximity to traffic and industrial sites, certain consumer products containing antimony-based flame retardants, and contaminated drinking water in some regions. Younger age, lower socioeconomic status, and proximity to traffic have been linked to higher antimony in German biomonitoring data.

Pair an elevated result with a broader heavy metals panel (lead, cadmium, arsenic, mercury), because exposures often cluster. If you have known cardiovascular or metabolic risk factors, treat antimony as one input alongside ApoB, blood pressure, HbA1c, and kidney function. If your level is markedly elevated or you suspect occupational exposure, consult with an occupational or environmental medicine specialist rather than trying to interpret the number alone.

When Results Can Be Misleading

A few practical points affect how a single reading should be interpreted:

• Collection completeness: a 24-hour urine result is only as good as the collection. Missing any portion of urine over the 24 hours, including the first morning void of the next day, will produce a falsely low total.
• Short half-life: because antimony clears in 24 to 95 hours, a single measurement reflects only your recent days of exposure. A normal result does not rule out heavier exposure that ended a few weeks ago.
• Assay variability: antimony is measured at very low concentrations using specialized lab techniques. Methods vary between labs, making direct comparison across providers unreliable.
• Recent occupational exposure: if you have spent time in a high-exposure setting in the days before testing, your number may transiently reflect that recent contact rather than your typical background.

How This Fits Into Prevention

Most heart and metabolic disease risk gets framed around cholesterol, blood pressure, blood sugar, and weight. Environmental metal exposure is a quieter input that does not show up on a standard panel. The evidence is observational, not from randomized trials, so causation is not proven. But the consistency of the signal across cardiovascular, metabolic, bone, and pregnancy outcomes argues for measuring exposure if you want a full picture of your risk profile, particularly if you live near traffic or industrial areas, work in an occupation with metal exposure, or already have heart, metabolic, or bone health concerns.