Testing Knowledge
Test Directory
Source-backed test guides: what each test is for, how it is performed, its limitations, and which reviewed products serve it. Personal health questions are answered with knowledge and preparation guidance — not supplier sales.
18-Hydroxycortisol Measurement
The determination of the amount of 18-hydroxycortisol present in a sample.
CD33 Expressing Cell Count
The determination of the amount of CD33 expressing cells per unit present in a sample.
Natural Killer Cell Activity Measurement
The determination of the amount of natural killer cell activity in a sample.
Carbon Monoxide Measurement
The determination of the amount of carbon monoxide present in a sample.
MMP-Degraded Type IV Collagen Fragment C4M Measurement
The determination of the amount of MMP-degraded type IV collagen fragment C4M in a sample.
Cytokeratin 18 Fragment Measurement
The determination of the amount of cytokeratin 18 fragment present in a sample.
Cytotoxic T-Lymphocyte Subpopulation to T-Lymphocyte Subpopulation Ratio Measurement
The determination of a sub-population of cytotoxic T-lymphocytes to a sub-population of T-lymphocytes present in a sample. The measurement may be expressed as a ratio or percentage.
Polymorphonuclear Pancreatic Elastase Measurement
The determination of the amount of polymorphonuclear pancreatic elastase present in a sample.
Absolute Eosinophil Count
The total number of white blood cells that are eosinophils. It is calculated by multiplying the white blood cell count by the percent of eosinophils in the differential white blood cell count.
Dietary Vitamin E Measurement
A determination of the vitamin E in a nutritional product or meal, or a portion thereof.
Serpin A12 Measurement
The determination of the amount of serpin A12 present in a sample.
Large Lymphocyte Count
The determination of the number of large lymphocytes present in a sample.
Oxidized LDL Cholesterol Antibody Measurement
The determination of the amount of oxidized low density lipoprotein cholesterol antibody in a biological specimen.
Dietary Caprylic Acid Measurement
A determination of the total 8:0 caprylic acid in a nutritional product or meal, or a portion thereof.
Tricarboxylic Acid Cycle Rate Measurement
A measurement of the metabolic rate of the tricarboxylic acid cycle in a biological specimen.
Oxytocin Measurement
The determination of the amount of oxytocin hormone present in a sample.
WD Repeat-Containing Protein 26 Measurement
The determination of the amount of WD-repeat containing protein 26 present in a sample.
Shell Vial Culture
A method for virus culture and detection in which a virus sample is mixed with a susceptible cell type and then centrifuged into a single layer of cells. Following a short incubation, viral growth is determined using immunological detection techniques.
Microbial-induced IgM, IgA, and/or IgG Antibody Measurement
The determination of the amount of microbial-induced IgM, IgA and/or IgG antibody in a sample.
Corynebacterium urealyticum Measurement
A measurement of Corynebacterium urealyticum in a sample.
Neutrophil Count
A test to determine the number of neutrophils in a sample of blood.
Gold Measurement
The determination of the amount of gold present in a sample.
Aspartate Aminotransferase to Creatinine Ratio Measurement
The determination of the ratio of aspartate aminotransferase compared to creatinine present in a sample. The measurement may be expressed as a ratio or percentage.
Alpha-Methylacyl Coenzyme A Racemase mRNA Measurement
The determination of the amount of alpha-methylacyl coenzyme A racemase mRNA in a biological sample.