Explore our database of over 4000 laboratory markers.

Search and Understand 4000+ Biomarkers

Fibrosis-4 (FIB-4)

Comprehensive Metabolic Panel (CMP): Biomarkers, Benefits, and Results Explained

Optimal range:   0 - 1.33 Score

Noninvasive estimate of liver scarring in HCV and HBV patients, to assess need for biopsy.

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Fibulin

Array 5 Multiple Autoimmune Reactivity Screen, Cyrex Laboratories

Optimal range:   0.4 - 1.3 ELISA Index

ANTIBODIES ASSOCIATED WITH:
This test by itself is not diagnostic for any condition or disease

Atherosclerotic Lesions
Osteoarthritis  

BODY TISSUE:

Joint

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Fig

Array 10 - Multiple Food Immune Reactivity Screen, Cyrex Laboratories

Optimal range:   0.2 - 2.2 ELISA Index

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Finasteride

ZRT Laboratory (Salivary Steroids), ZRT Laboratory

Optimal range:   0 - 5 pg/mL

Finasteride is a 5α-reductase inhibitor used to block the formation of the potent androgen DHT from its precursor, testosterone. It is used to treat benign prostatic hyperplasia as well as male pattern baldness in men and women, and excessive facial or body hair growth in women.

Serum testosterone levels increase as a result of the reduced conversion to DHT, but the increase is not usually outside the normal range

. Treatment with finasteride has been linked with sexual side effects.

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Firmicutes

GI-MAP Interpretive Guide by Diagnostic Solutions, Diagnostic Solutions Laboratory | GI-MAP & Food Sensitivity Tests

Optimal range:   57000000000 - 300000000000 Units

Gram-negative Bacteroidetes and grampositive Firmicutes are bacterial phyla that dominate the entire human digestive tract, including the mouth, nose, throat, and colon.2 An abnormal result in one or both of these phylum suggest imbalanced normal microbes in the GI tract. Further, high Firmicutes and low Bacteroidetes (resulting in a high F/B ratio) suggest microbial imbalance which may be related to increased caloric extraction from food, fat deposition and lipogenesis, impaired insulin sensitivity, and increased inflammation.

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Firmicutes

GI360 stool profile, Doctor's Data

Reference range:   -3, -2, -1, 0, +1, +2, +3

Gram-negative Bacteroidetes and grampositive Firmicutes are bacterial phyla that dominate the entire human digestive tract, including the mouth, nose, throat, and colon.2 An abnormal result in one or both of these phylum suggest imbalanced normal microbes in the GI tract. Further, high Firmicutes and low Bacteroidetes (resulting in a high F/B ratio) suggest microbial imbalance which may be related to increased caloric extraction from food, fat deposition and lipogenesis, impaired insulin sensitivity, and increased inflammation.

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Firmicutes Phylum

Stool

2200 GI Effects Comprehensive Profile - Stool, Genova Diagnostics

Reference range:   -50%, -25%, 0%, +25%

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Firmicutes Phylum

Complete Microbiome Mapping (NutriPATH), NutriPATH

Optimal range:   3.5 - 40 %

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Firmicutes Phylum

The GI – Advanced Profile (US BioTek), US BioTek

Optimal range:   3.5 - 40 %

The marker "Firmicutes Phylum" refers to a significant group of bacteria commonly found in the human gut. Firmicutes are one of the most abundant types of bacteria in the human digestive tract, playing a crucial role in the body's ability to digest and absorb nutrients. They are also involved in the synthesis of certain vitamins and the regulation of our immune system. A GI panel often measures the levels of Firmicutes to assess the balance of microbial populations in the gut. An imbalance in these bacteria can be linked to various health conditions, including digestive disorders, obesity, and metabolic issues. When analyzing GI panel results, high or low levels of Firmicutes can provide insights into the individual's gut health, pointing towards potential dysbiosis (microbial imbalance) and guiding appropriate dietary or medical interventions to restore balance and support overall health.

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Firmicutes/Bacteroidetes (F/B Ratio)

2200 GI Effects Comprehensive Profile - Stool, Genova Diagnostics

Optimal range:   12 - 620 Ratio

The F/B ratio provides an estimate of the predominance of two major phyla of commensal organisms, which has been associated with a number of metabolic disorders.

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Firmicutes:Bacteroidetes Ratio

GI-MAP Interpretive Guide by Diagnostic Solutions, Diagnostic Solutions Laboratory | GI-MAP & Food Sensitivity Tests

Optimal range:   0 - 1 Ratio

An abnormal result in one or both of these phylum suggest imbalanced normal microbes in the GI tract.

Gram-negative Bacteroidetes and grampositive Firmicutes are bacterial phyla that dominate the entire human digestive tract, including the mouth, nose, throat, and colon. 

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Firmicutes:Bacteroidetes Ratio

The GI – Advanced Profile (US BioTek), US BioTek

Optimal range:   0 - 1 Ratio

The "Firmicutes:Bacteroidetes Ratio" is an important marker that provides insights into the composition of gut microbiota. Firmicutes and Bacteroidetes are two major groups of bacteria commonly found in the human gut. Each plays a critical role in digestion and overall health. The ratio between these two types of bacteria can indicate different states of gut health and has been linked to various conditions. For instance, an imbalance, often reflected in a higher Firmicutes to Bacteroidetes ratio, has been associated with obesity and other metabolic disorders. Conversely, a lower ratio might be observed in leaner individuals. This marker helps healthcare providers understand the bacterial balance within a patient’s gastrointestinal tract, offering clues about the patient's metabolic health and potential digestive issues. Analyzing this ratio allows practitioners to recommend specific dietary or therapeutic interventions aimed at restoring a healthy balance of gut microbiota, thereby improving the patient's overall health.

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Firmicutes:Bacteroidetes Ratio

Stool

BiomeFx, Microbiome Labs

Optimal range:   0.677 - 2.907 Ratio

In adults, Firmicutes and Bacteroidetes are the most abundant bacterial phyla in the gut. The Firmicutes to Bacteroidetes (F/B) abundance ratio was shown to increase from infancy to adulthood and subsequently to decrease again in the elderly. Elevated F/B ratios have been linked to obesity though the evidence is not conclusive.

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Flavivirus IgG EIA

Infectious Disease Profile

Reference range:   Non-Reactive, Reactive

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Flavivirus IgM

Zika Virus

Optimal range:   0 - 0 Units

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Flax Seed

Array 10 - Multiple Food Immune Reactivity Screen, Cyrex Laboratories

Optimal range:   0.1 - 1.3 ELISA Index

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Flu (Influenza)

Vaccination

Vaccination Tracker

Reference range:   Vaccinated, Not Vaccinated

Influenza, commonly known as the flu, is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and lungs. It can range from mild to severe, potentially leading to hospitalization and, in some cases, death.

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Fluoroquinolones

GI-MAP Interpretive Guide by Diagnostic Solutions, Diagnostic Solutions Laboratory | GI-MAP & Food Sensitivity Tests

Reference range:   Negative, Positive

The GI-MAP includes results for detection of H. pylori antibiotic resistance genes. If an antibiotic resistance gene is present, then that class of antibiotics is designated POSITIVE for antibiotic resistance. A positive result for the presence of resistance genes for a given antibiotic indicates that the antibiotic is not an ideal choice for an antibiotic protocol. Since microbes can rapidly share DNA under stress, the presence of antibiotic resistance is reason enough to avoid that drug class.

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Fluoroquinolones

Stool

Optimal range:   0 - 0.0001 Units

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Folate

Micronutrient Test, Spectracell Laboratories, SpectraCell Laboratories

Optimal range:   38 - 100 %

Folate (Folic Acid) is needed to produce blood cells and other new tissue cells. Folate is a generic term for a group of pteridine compounds essential for one-carbon unit metabolism. Folates are involved in the synthesis of DNA, RNA, and tRNA necessary for cell growth. Folates are required for metabolism of methionine, histidine, tryptophan, glycine, serine, and formate. Interactions with Vitamin B6 and B12 also occur from common metabolic pathways. Folate function is necessary to prevent accumulation of homocystine. Deficient folate status of pregnant females is also directly linked to incidence of birth defects, especially neural tube defects such as spina bifida.

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