The human body attempts to eliminate xenobiotics (foreign organic chemicals) through a concerted effort of enzymatic “functionalization” (phase I) and conjugation (phase II).

Functionalization involves chemical modification of the xenobiotic by the cytochrome P-450 or the “mixed function oxidase” enzyme systems. Once functionalized, the altered xenobiotic can then be conjugated and excreted.

Urinary D-glucaric acid, a hepatic byproduct of enzymatic response to chemical toxins (phase I), is a reliable indicator of exposure to xenobiotics.

D-Lactate is produced by bacteria residing in the colon when carbohydrates are not completely absorbed in the small intestine. This by-product is excreted in the urine.

- Only elevated is of concern. D-lactic acid is generally produced in minimal quantities by human cells. It comes from three sources,

    1. from human methylglyoxal (MGO) pathway (assumed to be the sole source of blood D-lactate in healthy people),

    2. production by gut bacteria (mostly in patients with short bowel syndrome (SBS)), and

    3. ingestion of preformed D-lactate.

- The source of D-lactic acid is dependent on the situation. MGO is a precursor of glycation of proteins and DNA, resulting in advanced glycation end products (AGEs), which is associated with increased oxidative stress. MGO is predominantly detoxified by the glyoxalase system (requires glutathione), with the majority going to D-lactate.

The Daily Average Temperature by Dr. Rind refers to a concept related to metabolic health. According to information from Dr. Rind's Center for Health, the average daytime temperature of an individual is influenced by the thyroid mechanism and metabolic health. Typically, an adult with a healthy thyroid and metabolism has an average mid-afternoon temperature around 98.6 degrees Fahrenheit (37.0°C).

Dr. Rind's Metabolic Temperature Graph is used to record and track daily average temperatures, often associated with monitoring metabolic health and thyroid function. It's worth noting that Dr. Rind's methods are utilized in contexts like addressing chronic fatigue syndrome.

The DAO:Histamine ratio helps identify subtle imbalances between histamine levels and DAO enzyme activity. Even if DAO levels are within the normal range, symptoms may still occur if histamine levels are elevated. A low ratio indicates that the amount of DAO is insufficient to manage the histamine present in the body. Treatments aimed at regulating either DAO or histamine levels can help restore balance and improve this ratio.

Elevated antibody levels can be clinically significant — while the antibodies themselves don’t destroy anything, they do trigger an inflammatory response that can cause significant destruction of tissue and resulting symptoms. This response is not necessarily dependent on antibody levels. However, an equivocal result may mean you are just beginning to exhibit an immune reaction, so this is an important time to take measures to support the body in damping immune reactivity.

Deamidated gliadin peptide (DGP) antibodies, measured as IgA or IgG (anti-DGP), are blood tests used in the evaluation of suspected celiac disease. These antibodies help detect an abnormal immune response to gluten and are particularly useful in situations where standard celiac tests may be less reliable.

Detection of gliadin antibodies aids in the diagnosis and monitoring of certain gluten-sensitive enteropathies, such as celiac disease and dermatitis herpetiformis.

Deamidated Gliadin Peptide (DGP) reflects immune reactivity to modified gluten proteins. Elevated DGP antibodies are associated with gluten-driven inflammation, increased intestinal permeability, and celiac or non-celiac gluten sensitivity, helping assess immune responses to gluten exposure.

Normal or low DGP antibody levels suggest appropriate immune tolerance to gluten-derived peptides and intact gut barrier function. In this context, gluten-related immune activation is unlikely to be a primary driver of symptoms.

The deformity rate in a semen analysis refers to the percentage of sperm with abnormal morphology or shape within a semen sample. The deformity rate is an essential factor in assessing male fertility because sperm with abnormal morphology may have difficulty fertilizing an egg.

The World Health Organization (WHO) provides reference values for normal sperm morphology in a semen analysis. According to the WHO criteria, a semen sample is considered normal when at least 4% of sperm exhibit normal morphology. Sperm with abnormal shapes can include those with misshapen heads, tails, or other structural abnormalities.

Dehydroepiandrosterone (DHEA) is a steroid that is produced by both the adrenal cortex and the testis. The levels of this steroid increase before the onset of puberty (adrenarche) and decrease significantly with age.

DHEA and DHEA-S are the major precursors of 17-ketosteroids.

DHEA levels peak at around age 25, then decline steadily through the following decades. DHEA can be converted downstream in the steroidogenic pathway to create androgens and estrogens. It has antioxidant and anti-inflammatory properties and can be protective against corticosterone’s neurotoxic effects.

Dehydroepiandrosterone (DHEA) is predominantly produced in the adrenal glands and serves as a precursor hormone for androstenedione and eventually estrone and testosterone. High levels of DHEA may be due to DHEA or pregnenolone supplementation. Additional research suggests DHEA elevations may also be due to such conditions as adult-onset adrenal hyperplasia, congenital adrenal hyperplasia, and very rarely, adrenal carcinoma. SULT2A1 catalyzes the sulfate conjugation of DHEA, and research suggests dopamine can induce this enzyme.