Explore our database of over 4000 laboratory markers.

Search and Understand 4000+ Biomarkers

Letrozole

ZRT Laboratory (Salivary Steroids), ZRT Laboratory

Optimal range:   0 - 5 pg/mL

Letrozole is an aromatase inhibitor used as an adjuvant treatment for hormone-dependent breast cancer. It inhibits peripheral estrogen production in fat tissues, where it prevents the conversion of testosterone into estradiol. It has similar safety and efficacy to anastrozole.

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Lettuce

Array 10 - Multiple Food Immune Reactivity Screen, Cyrex Laboratories

Optimal range:   0.1 - 1.5 ELISA Index

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Leucine

Urine

Amino Acids; Urine 24-hour (Doctor's Data), Doctor's Data

Optimal range:   12 - 95 qmol/24 hours

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Leucine

Blood

NutriStat Basic Profile, US BioTek

Optimal range:   121 - 254 umol/L

Branched Chain Amino Acids (Isoleucine, Leucine, Valine) are the three branched chain amino acids (BCAAs). Branched chain amino acids (BCAA) are essential amino acids and must be obtained from the diet (mainly meat, grains, and dairy).

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LEUCINE

Urine

Amino Acid Analysis, LC/MS, Quest Diagnostics

Optimal range:   0 - 7 mmol/mol creatinine

Branched Chain Amino Acids (Isoleucine, Leucine, Valine) are the three branched chain amino acids (BCAAs). Branched chain amino acids (BCAA) are essential amino acids and must be obtained from the diet (mainly meat, grains, and dairy).

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Leucine

OMX Organic Metabolomics / Diagnostic Solutions, Diagnostic Solutions Laboratory

Optimal range:   0 - 44.8 nmol/mg Creatinine

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Leucine

Amino Acid Analysis, Quest Diagnostics

Optimal range:   73 - 182 umol/L

Branched Chain Amino Acids (Isoleucine, Leucine, Valine) are the three branched chain amino acids (BCAAs). Branched chain amino acids (BCAA) are essential amino acids and must be obtained from the diet (mainly meat, grains, and dairy).

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Leucine

Amino Acid Profile, Qn (Urine), LabCorp

Optimal range:   5 - 129.1 umol/g Cr

Branched Chain Amino Acids (Isoleucine, Leucine, Valine) are the three branched chain amino acids (BCAAs). Branched chain amino acids (BCAA) are essential amino acids and must be obtained from the diet (mainly meat, grains, and dairy).

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Leucine

3102 ION (Blood/Urine) Amino Acids 40, Genova Diagnostics

Optimal range:   9 - 25.3 qmol/dL

Branched Chain Amino Acids (Isoleucine, Leucine, Valine) are the three branched chain amino acids (BCAAs). Branched chain amino acids (BCAA) are essential amino acids and must be obtained from the diet (mainly meat, grains, and dairy).

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Leucine

Amino Acids test [Great Plains Laboratory / Doctor's Data], Doctor's Data

Optimal range:   15 - 80 qM/g creatinine

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Leucine

Amino Acid Profile, Qn (Plasma), LabCorp

Optimal range:   66.7 - 165.7 umol/L

Leucine, together with isoleucine and valine, are essential amino acids that are referred to as branched-chain amino acids (BCAAs).

Leucine is nutritionally essential and is required for formation of body proteins, enzymes and some hormones. Leucine itself has a hormone-like activity which is stimulation of pancreatic release of insulin. The branched-chain structure of leucine makes it very important for the formation of flexible collagen tissues, particularly elastin in ligaments. Leucine is relatively abundant in all protein foods.

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Leucine

NutrEval Plasma - Urine and Blood, Genova Diagnostics

Optimal range:   9 - 25.3 Units

Branched Chain Amino Acids (Isoleucine, Leucine, Valine) Isoleucine, leucine and valine are the three branched chain amino acids (BCAAs).

Branched chain amino acids (BCAA) are essential amino acids and must be obtained from the diet (mainly meat, grains, and dairy). 

Not only do the BCAAs account for almost 50% of muscle protein, but they have many metabolic functions. 

BCAAs act as substrates for protein synthesis, energy production, neurotransmitter production, glucose metabolism, and the immune response. They are also involved in stimulation of albumin and glycogen synthesis, improvement of insulin resistance, inhibition of free radical production, and hepatocyte apoptosis with liver regeneration.

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Leucine

Metabolimix+, Genova Diagnostics

Optimal range:   6 - 61 micromol/g creatinine

Branched Chain Amino Acids (Isoleucine, Leucine, Valine) are the three branched chain amino acids (BCAAs). Branched chain amino acids (BCAA) are essential amino acids and must be obtained from the diet (mainly meat, grains, and dairy).

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Leucine

Male Comprehensive Metabolic Performance Profile (Urine) Physicians Lab, Physicians Lab

Optimal range:   1148.6 - 2711.6 ng/mg CR

Branched Chain Amino Acids (Isoleucine, Leucine, Valine) are the three branched chain amino acids (BCAAs). Branched chain amino acids (BCAA) are essential amino acids and must be obtained from the diet (mainly meat, grains, and dairy).

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Leucine (Plasma)

Amino Acids 40 Profile, Genova Diagnostics

Optimal range:   74 - 196 µmol/L , 7.40 - 19.60 µmol/dL

Leucine, together with isoleucine and valine, are essential amino acids that are referred to as branched-chain amino acids (BCAAs).

Leucine is nutritionally essential and is required for formation of body proteins, enzymes and some hormones. Leucine itself has a hormone-like activity which is stimulation of pancreatic release of insulin. The branched-chain structure of leucine makes it very important for the formation of flexible collagen tissues, particularly elastin in ligaments. Leucine is relatively abundant in all protein foods.

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Leucine (Plasma)

OMX Organic Metabolomics / Diagnostic Solutions, Diagnostic Solutions Laboratory

Optimal range:   57.1 - 187.5 nmol/ML

Branched Chain Amino Acids (Isoleucine, Leucine, Valine) are the three branched chain amino acids (BCAAs). Branched chain amino acids (BCAA) are essential amino acids and must be obtained from the diet (mainly meat, grains, and dairy).

- Activator of mTOR

- 3-hydroxymethylglutaric acid (HMG) is an “off-product” intermediate in leucine degradation

- Has an anabolic effect on cell signaling and protein synthesis; an activator of the mammalian target of rapamycin (mTOR).

- Elevated urine levels have been associated with higher colorectal cancer rates and a possible biomarker of rheumatoid arthritis (along with phenylalanine).

- Leucine supplementation has been shown to increase plasma ammonia concentrations.

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Leucine (Serum)

Serum

Micronutrient (Vibrant America), Vibrant America

Optimal range:   101.2 - 249.3 nmol/ML

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Leucine (Urine)

Amino Acids Analysis, Genova Diagnostics

Optimal range:   4 - 46 micromol/g creatinine

Leucine, together with isoleucine and valine, are essential amino acids that are referred to as branched-chain amino acids (BCAAs).

Leucine is nutritionally essential and is required for formation of body proteins, enzymes and some hormones. Leucine itself has a hormone-like activity which is stimulation of pancreatic release of insulin. The branched-chain structure of leucine makes it very important for the formation of flexible collagen tissues, particularly elastin in ligaments. Leucine is relatively abundant in all protein foods.

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Leuconostoc

Gut Zoomer by Vibrant Wellness, Vibrant Wellness

Optimal range:   10 - 100 Units

The marker "Leuconostoc" is designed to provide insight into the presence and levels of Leuconostoc bacteria in your gut microbiome.

Leuconostoc is a genus of bacteria that is often associated with the fermentation process of various foods and beverages, such as sauerkraut, kimchi, and some dairy products. In the context of gut health, Leuconostoc can play a beneficial role by contributing to the fermentation process within the intestine, which can help in the production of certain vitamins and the improvement of digestive health.

However, like many aspects of the gut microbiome, balance is key. An overabundance or deficiency of Leuconostoc can indicate an imbalance in the gut flora, which might be associated with various health issues, including digestive disorders or impaired immune function.

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Leukemia/Lymphoma/Myeloma Panel by Flow Cytometry

Tumor / Cancer screening tests

Reference range:   No evidence of monoclonal B cell population, Evidence of monoclonal B-cell population

The Leukemia/Lymphoma/Myeloma Panel by Flow Cytometry is a specialized diagnostic test used in the field of hematology (=the study of blood and blood disorders) to analyze and classify various blood and bone marrow disorders, including: 

Leukemia (Leukemia is a broad term for cancers of the blood cells)

Lymphoma (a broad term for cancer that begins in cells of the lymph system)

→ and Myeloma (a cancer of the plasma cells).

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