Explore our database of over 4000 laboratory markers.

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HVA

ZRT Laboratory (Urinary Neurotransmitters), ZRT Laboratory

Optimal range:   3737 - 7048 µg/g creatinine

Homovanillate (aka Homovanillic Acid) is a dopamine metabolite.

Homovanillate and Vanilmandelate are breakdown products from neurotransmitters involved in hormone and nerve impulse transmission, called catecholamines.

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HVA / VMA Ratio

Organic Acids Test (OAT) - Nutritional and Metabolic Profile, Mosaic Diagnostics

Optimal range:   0.16 - 1.8 Ratio

The Organic Acids Test measures levels of HVA (homovanillic acid) and VMA (vanillylmandelic acid), the metabolites of the neurotransmitters, dopamine and epinephrine/norepinephrine. It also measures the ratio of the two metabolites.

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HVA / VMA Ratio (Males Age 13 and Over)

Organic Acids Test (OAT) - Nutritional and Metabolic Profile, Mosaic Diagnostics

Optimal range:   0.32 - 1.4 Ratio

The Organic Acids Test measures levels of HVA (homovanillic acid) and VMA (vanillylmandelic acid), the metabolites of the neurotransmitters, dopamine and epinephrine/norepinephrine. It also measures the ratio of the two metabolites.

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HVA / VMA Ratio (Males Under Age 13)

Organic Acids Test (OAT) - Nutritional and Metabolic Profile, Mosaic Diagnostics

Optimal range:   0.23 - 2.8 mmol/mol creatinine

The Organic Acids Test measures levels of HVA (homovanillic acid) and VMA (vanillylmandelic acid), the metabolites of the neurotransmitters, dopamine and epinephrine/norepinephrine. It also measures the ratio of the two metabolites.

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HVA/ DOPAC Ratio

Organic Acids Test (OAT) - Nutritional and Metabolic Profile, Mosaic Diagnostics

Optimal range:   0.1 - 1.8 Ratio

HVA and DOPAC are the major metabolites of dopamine. HVA stands for Homovanillic acid and DOPAC stands for Dihydroxyphenylacetic.

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HVA/ DOPAC Ratio (Males Age 13 and Over)

Organic Acids Test (OAT) - Nutritional and Metabolic Profile, Mosaic Diagnostics

Optimal range:   0.17 - 1.6 mmol/mol creatinine

HVA and DOPAC are the major metabolites of dopamine. HVA stands for Homovanillic acid and DOPAC stands for Dihydroxyphenylacetic.

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HVA/ DOPAC Ratio (Males Under Age 13)

Organic Acids Test (OAT) - Nutritional and Metabolic Profile, Mosaic Diagnostics

Optimal range:   0.37 - 3.3 mmol/mol creatinine

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HVA/DOPAC

Organic Acids, Vibrant Wellness

Optimal range:   2.6 - 8.3 Ratio

HVA and DOPAC are the major metabolites of dopamine. HVA stands for Homovanillic acid and DOPAC stands for Dihydroxyphenylacetic.

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HVA/DOPAC Ratio

Organic Acids, Vibrant Wellness

Optimal range:   2.6 - 8.3 Ratio

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HVA/VMA Ratio

Neurotransmitters (VibrantWellness), Vibrant Wellness

Optimal range:   0.74 - 1.88 Ratio

The Organic Acids Test measures levels of HVA (homovanillic acid) and VMA (vanillylmandelic acid), the metabolites of the neurotransmitters, dopamine and epinephrine/norepinephrine. It also measures the ratio of the two metabolites.

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Hyaline Cast

Urinalysis

Optimal range:   0 - 1.9 casts/lpf

Urinary casts are tiny tube-shaped particles that can be found when urine is examined under the microscope during a test called urinalysis. Hyaline casts can be present in low numbers (0-1/LPF) in concentrated urine of otherwise normal patients and are not always associated with renal disease.

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HYALINE CAST

Urinalysis, complete, Quest Diagnostics

Reference range:   NONE SEEN, DETECTED

Urinary casts are tiny tube-shaped particles that can be found when urine is examined under the microscope during a test called urinalysis. Hyaline casts can be present in low numbers (0-1/LPF) in concentrated urine of otherwise normal patients and are not always associated with renal disease.

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Hydrogen (H2)

Small Intestinal Bacterial Overgrowth (SIBO) 3 Hour, Genova Diagnostics

Optimal range:   0 - 20 ppm

Hydrogen increase over baseline by 90 minutes.

A rise of ≥ 20 ppm from baseline in hydrogen by 90 min should be considered a positive test to suggest the presence of SIBO

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Hydrogen Sulfide (H2S) production

Stool

BiomeFx, Microbiome Labs

Optimal range:   2.23 - 12.41 Healthy Relative Abundance IQR (%)

Sulfate-reducing bacteria convert dietary sulfur and taurine to H2S, a toxic compound that impairs intestinal detoxification pathways and can cause gas that smells like rotten eggs. H2S production is associated with high-protein, low-fiber diets. Sulfate-reducing bacteria compete with methane-producers and acetate-producers for the same H2 substrate; and as a result, it is important to maintain a delicate balance among all three.

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Hydroxykynurenine

OMX Organic Metabolomics / Diagnostic Solutions, Diagnostic Solutions Laboratory | GI-MAP & Food Sensitivity Tests

Optimal range:   0 - 18 nmol/mg Creatinine

3-Hydroxykynurenine is a metabolic intermediate of the kynurenine pathway that elicits neurotoxic effects.

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Hydroxylysine

Amino Acid Profile, Qn (Plasma), LabCorp

Optimal range:   0.1 - 0.8 umol/L

Hydroxylysine is an amino acid related to collagen.

What is collagen?

Collagen is the most abundant protein in your body. It is the major component of connective tissues that make up several body parts, including tendons, ligaments, skin and muscles.

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Hydroxylysine

Blood

NutriStat Basic Profile, US BioTek

Optimal range:   0.2 - 0.4 umol/L

Hydroxylysine is an amino acid related to collagen.

What is collagen?

Collagen is the most abundant protein in your body. It is the major component of connective tissues that make up several body parts, including tendons, ligaments, skin and muscles.

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Hydroxylysine

Amino Acid Profile, Qn (Urine), LabCorp

Optimal range:   0.1 - 37.3 umol/g Cr

Hydroxylysine is an amino acid related to collagen.

What is collagen?

Collagen is the most abundant protein in your body. It is the major component of connective tissues that make up several body parts, including tendons, ligaments, skin and muscles.

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Hydroxylysine

NutriStat, NutriPATH

Optimal range:   0.2 - 0.4 umol/L

Hydroxylysine is an amino acid related to collagen.

What is collagen?

Collagen is the most abundant protein in your body. It is the major component of connective tissues that make up several body parts, including tendons, ligaments, skin and muscles.

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HYDROXYLYSINE

Urine

Amino Acid Analysis, LC/MS, Quest Diagnostics

Optimal range:   0 - 9 mmol/mol creatinine

Hydroxylysine is an amino acid related to collagen.

What is collagen?

Collagen is the most abundant protein in your body. It is the major component of connective tissues that make up several body parts, including tendons, ligaments, skin and muscles.

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