Instalab

Mono-(2-ethyl-5-oxohexyl) Phthalate Test Urine

Get a research-grade read on how much plastic-softening chemical your body is absorbing from food packaging, cosmetics, and household products.

Should you take a MEOHP test?

This test is most useful if any of these apply to you.

Trying to Conceive or Pregnant
Higher levels have been linked to infertility and to lower mental and motor scores in infants, so reducing exposure now matters for two.
Eating a Lot of Packaged Food
Diet is the dominant DEHP exposure route, and this test shows whether your habits are translating into measurable chemical load.
Watching Your Thyroid or Metabolic Health
If your TSH, insulin, or liver markers are drifting, this can reveal whether environmental chemical exposure is contributing.
Healthy but Want to Stay Ahead
Most adults have detectable exposure but never measure it; getting a baseline now lets you track your progress as you reduce plastic in your life.

About Mono-(2-ethyl-5-oxohexyl) Phthalate

If you eat packaged food, use scented personal care products, or live in a typical modern home, your body is breaking down a plastic-softening chemical called DEHP (di-2-ethylhexyl phthalate) every day. This urine test catches one of the chemical signatures it leaves behind, giving you a window into an exposure that no standard checkup measures.

Higher levels have been linked in human studies to thyroid disruption, fatty liver, insulin resistance, obesity, infertility, and a marker of nerve cell damage. The number itself does not diagnose any disease, but it tells you something useful: how much of a chemical that may be quietly contributing to those risks is currently flowing through you.

What This Test Actually Measures

MEOHP (mono-2-ethyl-5-oxohexyl phthalate) is one of the breakdown products your liver creates after you eat, breathe in, or absorb DEHP through your skin. DEHP itself is added to plastics, vinyl, food packaging, medical tubing, fragrances, and many cosmetics to make them flexible. Once inside you, it is rapidly converted into smaller pieces, including MEOHP, which then exit through your urine.

MEOHP and its sister metabolite MEHHP (mono-2-ethyl-5-hydroxyhexyl phthalate) appear in urine at roughly 10 times the concentration of MEHP, the simplest DEHP breakdown product, which makes them more sensitive markers of exposure. They are also less prone to contamination during sample collection, because unlike MEHP, they cannot form from stray DEHP touching the sample container.

This is an exposure biomarker, not a disease test. It tells you how much DEHP your body has been processing recently, not whether any specific organ has been harmed. That distinction matters for how you should read your number.

Why DEHP Exposure Is Worth Tracking

Urinary MEOHP and MEHHP are detected in more than 90% of Canadians aged 6 to 49, with similar near-universal detection in European, German, and U.S. survey populations. Children typically show higher levels than adolescents and adults. Almost everyone has measurable exposure, but the amount varies widely between people based on diet, products used, occupation, and home environment.

A genome-wide study found that variants near the CYP2C9, CYP2C19, and SLC17A1 genes (which influence how your body breaks down and clears chemicals) explain about 8 to 9% of person-to-person differences in 24-hour MEHHP and MECPP excretion. Genetics shape the number somewhat, but most of the variation comes from how much DEHP you are actually being exposed to.

Thyroid Disruption

A meta-analysis of human studies found that higher DEHP exposure, indexed by metabolites including MEOHP, is associated with disruption of the brain-pituitary-thyroid system. In a Korean national survey of about 6,000 adults, higher urinary phthalate metabolites tracked with slightly higher TSH (thyroid stimulating hormone) and lower total and free T4. The shifts are modest, but they suggest the chemical is nudging your thyroid signaling in a direction associated with sluggish hormone output.

A separate cross-sectional study of 420 people found that higher phthalate exposure was linked to greater risk of thyroid cancer and benign thyroid nodules, with oxidative stress markers (signs of cellular damage from unstable molecules) appearing to mediate the connection.

Metabolic and Liver Health

In a study of 3,137 U.S. adults, higher levels of phthalate metabolites including MEOHP and MEHHP were associated with greater odds of MAFLD (metabolic dysfunction-associated fatty liver disease, the modern name for the most common type of fatty liver). In a separate analysis of 9,141 U.S. adults, higher DEHP metabolites tracked with higher triglycerides and lower HDL cholesterol, the classic dyslipidemia pattern that drives heart disease risk.

A panel study of 560 elderly Koreans found that higher summed DEHP metabolites (MEHHP plus MEOHP) were linked to greater insulin resistance, with oxidative stress appearing to be the mechanism. Pregnant women in the U.S. Healthy Start cohort showed similar patterns, with higher DEHP metabolites tracking with worse glucose-insulin regulation. In an analysis from the Aragon Workers' Health Study of 1,124 men, higher MEOHP was positively associated with general obesity.

Reproductive Health

In a study of 325 Jordanian women attending fertility clinics, those with higher urinary MEOHP (median around 59 micrograms per liter, a unit measuring very small concentrations) had significantly higher rates of infertility. A pooled analysis of 857 U.S. women similarly found that combined exposure to phenols and phthalates, including DEHP metabolites, was associated with higher infertility risk. Serum MEOHP has also been linked to lower estradiol and altered ovarian reserve markers in women of reproductive age.

Neurological Signals

In an NHANES analysis of 619 U.S. adults, higher urinary DEHP metabolites including MEOHP and MEHHP were associated with higher serum neurofilament light chain, a blood marker that rises when nerve cells are being damaged. In a Korean prospective cohort, higher prenatal MEHHP and MEOHP were linked to lower mental and psychomotor scores in infants at 6 months of age, with stronger effects in boys.

Reference Ranges

There are no consensus clinical cutpoints for MEOHP. This is a research and biomonitoring marker, not a guideline-supported clinical test, so any number you receive is best interpreted as a position on a population distribution rather than a pass-fail score. The values below come from population biomonitoring surveys and small clinical samples, with concentrations expressed in micrograms per gram of creatinine (a unit that adjusts for how dilute or concentrated your urine sample is). They are illustrative orientation, not targets. Your lab may use different units.

PopulationReported Central ValueSource
U.S. paired urine samplesMEOHP and MEHHP roughly 10x higher than MEHPKato et al. 2004
Canadian general population, ages 6 to 49Detected in over 90% of samplesSaravanabhavan et al. 2013
Pregnant African American women (MEHHP)About 6 to 7 micrograms per gram creatinineZhang et al. 2021
Jordanian women at fertility clinicsMedian around 59 micrograms per literAbdo et al. 2023

What this means for you: a number sitting at the high end of population distributions, or one that is markedly higher than your own baseline, is a signal worth acting on by reducing exposure, not a diagnosis. Compare your results within the same lab over time for the most meaningful trend.

Why a Single Reading Is Not Enough

MEOHP has substantial within-person variability over time. A systematic meta-analysis of biomarker reproducibility found that intraclass correlation coefficients for MEOHP were poor to moderate (a statistical measure of how consistent repeat measurements are in the same person), with values around 0.32 across studies. That means a single spot urine sample only modestly reflects your typical exposure, because DEHP enters and leaves your body within hours.

Spot urine samples can overestimate longer-term exposure peaks by up to roughly 2-fold. The practical takeaway: do not put too much weight on a single number. A baseline reading, a follow-up 2 to 3 months after making product changes, and at least annual retesting will give you a far clearer picture than any one snapshot.

When Results Can Be Misleading

  • Recent exposure spikes: Eating a meal in plastic packaging, applying scented personal care products, or spending time near vinyl flooring or new plastics in the hours before testing can transiently raise your number without reflecting your usual exposure.
  • Hydration status: Very dilute or very concentrated urine can shift the raw number. Most labs report results adjusted for creatinine to correct for this.
  • Hospital or medical procedures: DEHP is used in IV bags, blood storage, and medical tubing. Recent hospitalization, surgery, or transfusion can elevate metabolite levels for reasons unrelated to your everyday environment.
  • Time of day and season: Levels can vary across the day and across seasons, with one small study showing a weak trend toward higher exposure in winter.

What to Do With an Elevated Result

If your MEOHP comes back high, the next step is not a specialist visit but a systematic look at your exposure sources. The major contributors documented in human studies are food (especially packaged, fast, microwaved, and canned foods), personal care products (especially scented lotions, perfumes, and cosmetics), plastic food containers, vinyl flooring, and indoor dust. A targeted reduction effort can drop levels meaningfully within months. Retest after 8 to 12 weeks of changes to confirm your strategy is working. If your levels stay persistently elevated despite environmental changes, occupational exposure (medical, manufacturing, cleaning, beauty industries) is worth investigating, and pairing this test with markers of thyroid function, fasting insulin, liver enzymes, and lipids can show whether the exposure is showing up in your physiology.

What Moves This Biomarker

Evidence-backed interventions that affect your MEOHP level

↑ Increase
Hospital exposure to medical plastics (IV bags, tubing, transfusions)
DEHP is widely used in medical devices including IV bags, blood storage bags, and tubing. In a study of 101 preterm infants in a neonatal intensive care unit, hospital-based DEHP exposure was associated with measurable urinary MEOHP and altered growth patterns during hospitalization. This is a real exposure that raises the biomarker, and matters mainly for people undergoing prolonged hospitalization or repeated transfusions.
LifestyleStrong Evidence
↓ Decrease
Reduce DEHP exposure across diet, products, and home environment
This is the only intervention with direct human evidence for lowering MEOHP. In a structured pregnancy intervention with 35 women, written guidance to avoid fast, canned, and microwaved food, restrict cosmetics, perfumes, and hair dyes, avoid plastic food containers and vinyl flooring, avoid second-hand smoke, and reduce car exposure produced a significant drop in urinary MEOHP and MEHHP after the first stage, with the sum of DEHP metabolites falling roughly 20 to 40% over the following months.
LifestyleModerate Evidence
↓ Decrease
Eat fewer packaged, fast, and processed foods
Diet is the dominant exposure route for DEHP in most adults. A Norwegian biomonitoring study using a physiologically-based model found that DEHP exposure from food is approximately 10 times higher than exposure from personal care products. A separate dose-response biomonitoring analysis in 327 adults identified meat, poultry, protein-rich foods, and packaged staples as major contributors. Shifting toward fresh, minimally packaged foods is the single highest-leverage dietary change for lowering MEOHP.
DietModerate Evidence
↓ Decrease
Limit cosmetics, perfumes, and scented personal care products
Personal care products are a smaller but real DEHP exposure pathway, particularly fragrances and body lotions. A modeled biomonitoring analysis identified body lotion as the main personal care product contributor to DEHP exposure. Cutting use of scented products was one component of the multi-pronged intervention that lowered MEOHP by 20 to 40% in pregnant women.
LifestyleModest Evidence
↓ Decrease
Replace plastic food containers and avoid microwaving in plastic
Heating and storing food in plastic containers can leach DEHP into the food, which then becomes ingested exposure measured as MEOHP in urine. Switching to glass, stainless steel, or ceramic containers was part of the behavioral intervention package that produced 20 to 40% reductions in DEHP metabolites in pregnant women over months.
LifestyleModest Evidence

Frequently Asked Questions

References

23 studies
  1. Biomonitoring of Phthalate Metabolites in the Canadian Population Through the Canadian Health Measures Survey (2007-2009).
    Saravanabhavan G, Guay M, Langlois É, Giroux S, Murray J, Haines DInternational Journal of Hygiene and Environmental Health2013
  2. Mono(2-ethyl-5-hydroxyhexyl) Phthalate and Mono-(2-ethyl-5-oxohexyl) Phthalate as Biomarkers for Human Exposure Assessment to Di-(2-ethylhexyl) Phthalate.
    Kato K, Silva MJ, Reidy J, Hurtz D, Malek NA, Needham L, Nakazawa H, Barr D, Calafat aEnvironmental Health Perspectives2004
  3. Associations of Urinary Di(2-ethylhexyl) Phthalate Metabolites With Lipid Profiles Among US General Adult Population
    Zhu X, Cheang I, Chen Z, Shi MW, Zhu Q, Yue X, Tang Y, Pang H, Liao S, Zhou Y, Li XHeliyon2023
  4. Relationship Between Phthalates Exposures and Metabolic Dysfunction-associated Fatty Liver Disease in United States Adults
    Sun J, Yang S, Zhang Y, Xiang W, Jiang XPLOS ONE2024
  5. Telomere Length as a Modifier in the Relationship Between Phthalate Metabolites Exposure and Glucose Homeostasis.
    Li R, Wang J, Wang Y, Lin X, Sun C, Xu LEnvironmental Pollution2024