HVA and DOPAC are the major metabolites of dopamine.

Produced when Clostridia acts upon unabsorbed tryptophan, tyrosine or phenylalanine.

Dihydroxyphenylpropionic Acid (DHPPA), also known as 3,4 dihydroxyphenylpropionic acid, is a byproduct of the fermentation of dietary phenols by several bacteria, including some Clostridia spp. and others. Although once thought to identify the presence of specific dysbiotic bacteria, ongoing research suggests there are several bacterial species potentially involved.

Dilute Russell's viper venom time (dRVVT) is a laboratory test often used for detection of lupus anticoagulant (LA). Russell's viper venom [RVV] isolated from the snake Daboia russelii contains a potent activator of factor X which in the presence of phospholipid, prothrombin and calcium ions clots fibrinogen to fibrin. In individuals with a lupus anticoagulant the antibody binds to the phospholipid inhibiting the action of the RVV and prolonging the clotting time. 

Organophosphates are one of the most toxic groups of substances in the world, primarily found in pesticide formulations. They are inhibitors of cholinesterase enzymes, leading to overstimulation of nerve cells, causing sweating, salivation, diarrhea, abnormal behavior, including aggression and depression. Children exposed to organophosphates have more than twice the risk of developing pervasive developmental disorder (PDD), an autism spectrum disorder. Maternal organophosphate exposure has been associated with various adverse outcomes including having shorter pregnancies and children with impaired reflexes.

Dimethyldithiophosphate (DMDTP) is a urinary metabolite that forms when the body breaks down certain organophosphate pesticides, such as malathion, dimethoate, and methyl parathion—chemicals commonly used in agriculture and among the most frequent causes of poisoning worldwide. Testing for DMDTP, as done on the Environmental Toxins panel by Vibrant Wellness, helps identify recent exposure to these pesticides, which can enter the body through inhalation, skin contact, or ingestion of contaminated food and water. Even at low levels, organophosphates may be harmful to the nervous system, particularly in fetuses, infants, and young children, due to their ability to inhibit cholinesterase enzymes that regulate nerve function. Chronic or repeated exposure has been associated with a wide range of symptoms, including headaches, confusion, memory problems, depression, speech difficulties, delayed reaction times, and sleep disturbances like insomnia and nightmares. Some individuals may also experience flu-like symptoms such as nausea, weakness, fatigue, and loss of appetite. Elevated levels of DMDTP do not always signal acute toxicity but can reflect an environmental toxic burden that may require lifestyle changes or detoxification support. To reduce exposure, individuals are encouraged to eat organic produce when possible, thoroughly wash fruits and vegetables, avoid the use of chemical pesticides at home, ensure proper ventilation in agricultural or treated environments, use protective equipment when handling pesticides, and support detox pathways with nutrients such as glutathione, folate, and B vitamins.

The amino acid derivative dimethylglycine (DMG) is produced when betaine (trimethylglycine) donates a methyl group to homocysteine for re-methylation back to methionine. This methyl donation is mediated by the enzyme betaine homocysteine methyltransferase (BHMT). Elevations in DMG act as a negative feedback by inhibiting this enzymatic conversion. [L]

Organophosphates are one of the most toxic groups of substances in the world, primarily found in pesticide formulations. They are inhibitors of cholinesterase enzymes, leading to overstimulation of nerve cells, causing sweating, salivation, diarrhea, abnormal behavior, including aggression and depression. Children exposed to organophosphates have more than twice the risk of developing pervasive developmental disorder (PDD), an autism spectrum disorder. Maternal organophosphate exposure has been associated with various adverse outcomes including having shorter pregnancies and children with impaired reflexes.

Organophosphates are one of the most toxic groups of substances in the world, primarily found in pesticide formulations. They are inhibitors of cholinesterase enzymes, leading to overstimulation of nerve cells, causing sweating, salivation, diarrhea, abnormal behavior, including aggression and depression. Children exposed to organophosphates have more than twice the risk of developing pervasive developmental disorder (PDD), an autism spectrum disorder. Maternal organophosphate exposure has been associated with various adverse outcomes including having shorter pregnancies and children with impaired reflexes.

Dimethylthiophosphate (DMTP) is a metabolite of organophosphates, which are among the most common causes of poisoning worldwide. Organophosphates are frequently used as pesticides and can enter the body through the lungs, skin, or by consuming contaminated food.

Even at low exposure levels, organophosphates may pose a serious risk to the nervous system, especially for foetuses and young children. Repeated or prolonged exposure may lead to a range of neurological symptoms, including:

• Impaired memory and concentration
• Disorientation and confusion
• Severe depression and irritability
• Headache and speech difficulties
• Delayed reaction times
• Sleep disturbances (such as nightmares, sleepwalking, drowsiness, or insomnia)

Diphenyl Phosphate (DPP) is a urinary metabolite that forms when the body breaks down organophosphate flame retardants such as triphenyl phosphate (TPHP), trixylenyl phosphate, and other aryl phosphate esters (APEs). These chemicals are used not only in consumer products like electronics, furniture, and cosmetics but also industrially as catalysts, paint additives, and protective agents in organic synthesis. DPP is measured to assess recent exposure, typically within the past 1–2 days, and elevated levels may indicate absorption through inhalation, skin contact, or ingestion. While originally used to reduce fire risk, these compounds are now linked to concerning health effects. Research shows that DPP may disrupt endocrine signaling, impair cardiac development, and contribute to mitochondrial dysfunction. In addition, DPP has been associated with renal toxicity, liver damage (hepatotoxicity), and blood-related effects (hemotoxicity). Monitoring DPP is especially important for vulnerable populations such as children, pregnant individuals, and those with frequent chemical exposure. Reducing contact with flame-retardant-treated products, improving indoor air quality, and supporting detoxification pathways are key strategies to lower your body burden.

This is a metabolite of the organophosphate flame retardant triphenyl phosphate (TPHP), which is used in plastics, electronic equipment, nail polish, and resins. TPHP can cause endocrine disruption. Studies have also linked TPHP to reproductive and developmental problems.

DPP is a metabolite of triphenyl phosphate (TPHP), which is used as plasticizer and a fire retardant for a variety of materials including electronic equipment, PVC, hydraulic fluids, glues, nail polishes, and casting resins. TPHP exhibits low acute toxicity by dermal or oral contact. Long-term exposure to TPHP has been linked with reproductive and developmental toxicity, neurotoxicity, metabolic disruption, endocrine effects, and genotoxicity.

Diphtheria is a contagious and potentially fatal disease caused by a bacterium called Corynebacterium diphtheria. Testing for the antibodies against the disease gives doctors an idea if you have immunity towards diphtheria.

Diphtheria antitoxoid antibodies are specific immunoglobulins (also known as antibodies) produced by the human immune system in response to the diphtheria toxoid vaccine or exposure to the bacterium Corynebacterium diphtheriae, which causes diphtheria.

What is Diphtheria?

Diphtheria is a serious bacterial infection that can lead to difficulty breathing, heart rhythm problems, and even death. It's caused by strains of bacteria called Corynebacterium diphtheriae that make toxin. Diphtheria spreads easily and happens quickly, and mainly affects the nose and throat. It's spread from person to person, usually through respiratory droplets, from coughing or sneezing.