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.
Free Thyroxine Measurement
The determination of the amount of free thyroxine present in a sample.
HLA-A Mismatch Count
The determination of the number of mismatch between the study subject and his or her donor for the human leukocyte antigen, class I, group A (HLA-A).
Glutamate and Glutamine Measurement
The determination of the amount of glutamate and glutamine in a biological specimen.
p16-INK4A Measurement
The determination of the amount of p16-INK4A present in a sample.
Skin-Homing Helper Central Memory T-Lymphocyte to Helper Central Memory T-Lymphocyte Ratio Measurement
The determination of the ratio of the skin-homing helper central memory T-lymphocytes to total helper central memory T-lymphocytes present in a sample. The measurement may be expressed as a ratio or percentage.
CSF Leukocyte Count
The number of leukocytes in the cerebrospinal fluid sample.
Immature Platelets to Total Platelets Ratio Measurement
The determination of the ratio of immature platelets compared to total platelets present in a sample. The measurement may be expressed as a ratio or percentage.
Plasmacytoid Lymphocyte to Lymphocyte Ratio Measurement
The determination of the ratio of plasmacytoid lymphocytes compared to all lymphocytes present in a sample. The measurement may be expressed as a ratio or percentage.
Normal Cell to Total Cell Ratio Measurement
The determination of the ratio of normal cells compared to total cells present in a sample. The measurement may be expressed as a ratio or percentage.
HDL Cholesterol to Total Cholesterol Ratio Measurement
The determination of the ratio of HDL cholesterol compared to total cholesterol present in a sample. The measurement may be expressed as a ratio or percentage.
Adenosine Triphosphate Measurement
The determination of the amount of adenosine triphosphate present in a sample.
MSD V-PLEX SARS-CoV-2 Panel 2 Kit N IgG Serology Assay
A proprietary serology assay that can be used to measure IgG antibodies against the SARS-CoV-2 nucleocapsid protein (N).
Viable Leukocyte to Nonviable Leukocyte Ratio Measurement
The determination of the ratio of viable leukocytes to non-viable leukocytes present in a sample. The measurement may be expressed as a ratio or percentage.
Gut-Homing Helper Memory T-Lymphocyte Count
The determination of the gut-homing helper memory T-lymphocytes present in a sample.
Alternaria tenuis alternata Antigen IgG Antibody Measurement
A measurement of the Alternaria tenuis alternata antigen IgG antibody in a biological specimen.
Tobacco Tar Measurement
The determination of the amount of tobacco tar in a sample.
Dengue Virus IgG Antibody Measurement
The determination of the amount of dengue virus IgG antibody in a biological sample.
Klebsiella oxytoca Measurement
The determination of the amount of Klebsiella oxytoca in a biological sample.
Macrophage Subpopulation to Macrophage Ratio Measurement
The determination of the ratio of a subpopulation of macrophages compared to total macrophages present in a sample. The measurement may be expressed as a ratio or percentage.
Tissue Polypeptide Antigen Measurement
The determination of the amount of tissue polypeptide antigen present in a sample.
Intermediate Monocyte to Non-TBNK Leukocyte Ratio Measurement
The determination of the ratio of the intermediate monocytes to all leukocytes that are not T-cells, B-cells, or natural killer cells, present in a sample. The measurement may be expressed as a ratio or percentage.
Venlafaxine Measurement
The determination of the amount of venlafaxine present in a sample.
Mitochondrial M2 IgG Antibody Measurement
The determination of the amount of mitochondrial M2 IgG antibody present in a sample.
Phosphatidylethanol 16:0-18:1 Homolog Measurement
The determination of the amount of the phosphatidylethanol 16:0-18:1 homolog present in a sample.