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.
Glomerular Filtration Rate from Creatinine, Urea Nitrogen, and Albumin Adjusted for Actual Body Surface Area Measurement
An estimation of the glomerular filtration rate based on the clearance of creatinine, urea nitrogen and albumin after adjusting it for an individual's actual body surface area.
Classical Memory B-Lymphocyte to B-Lymphocyte Ratio Measurement
The determination of the ratio of classical memory B-lymphocytes to total B-lymphocytes present in a sample. The measurement may be expressed as a ratio or percentage.
Innate Lymphoid Cell Count
The determination of the amount of innate lymphoid cells present in a sample.
Cocaine, Benzoylecgonine, and/or Ecgonine Measurement
The determination of the amount of cocaine, benzoylecgonine, and/or ecgonine present in a sample.
Natural Killer Cells to Total Cells Ratio Measurement
The determination of the ratio of the natural killer cells to total cells present in a sample. The measurement may be expressed as a ratio or percentage.
Immunoglobulin G and Immunoglobulin M Measurement
The determination of the total amount of IgG and IgM present in a sample.
Gut-Homing Helper Central Memory T-Lymphocyte to Helper T-Lymphocyte Ratio Measurement
The determination of the ratio of the gut-homing helper central memory T-lymphocytes to total helper T-lymphocytes present in a sample. The measurement may be expressed as a ratio or percentage.
Free Trans-3'-Hydroxycotinine Measurement
The determination of the free (unbound) trans-3'-hydroxycotinine present in a sample.
Methyltestosterone Measurement
The determination of the amount of the methyltestosterone in a sample.
HLA-DR52 Antibody Measurement
The determination of the amount of HLA-DR52 antibody present in a sample.
Antibody-secreting Cells Measurement
The determination of the antibody-secreting cells in a biospecimen.
B-Lymphocytes Subpopulation Count
The determination of the amount of B-lymphocytes subpopulation present in a sample.
Viable Cells by Automated Count
The determination of the number of viable cells in a sample using automated counting.
Metamyelocyte to Leukocyte Ratio Measurement
The determination of the ratio of metamyelocytes compared to leukocytes present in a sample. The measurement may be expressed as a ratio or percentage.
Streptococcus pneumoniae Serotype 22F IgG Antibody Measurement
The determination of the amount of Streptococcus pneumoniae serotype 22F IgG antibody present in a sample.
Tumstatin Measurement
The determination of the amount of tumstatin in a sample.
Factor XIV Activity Actual to Control Ratio Measurement
The determination of the ratio of the biological activity of factor XIV dependent coagulation in a subject's specimen when compared to the same activity in a control specimen. The measurement may be expressed as a ratio or percentage.
Dietary Phosphorus Measurement
A determination of the phosphorus in a nutritional product or meal, or a portion thereof.
Cyclic Citrullinated Peptide IgG Antibody Measurement
The determination of the amount of cyclic citrullinated peptide IgG antibody present in a sample.
Triiodothyronine Measurement
The determination of the amount of free and bound triiodothyronine present in a sample.
Treponema pallidum Measurement
The determination of the amount of Treponema pallidum in a biological sample.
Progenitor B-Lymphocyte to Total Cells Ratio Measurement
A relative measurement (ratio) of the progenitor B-lymphocytes to total cells present in a sample. The measurement may be expressed as a ratio or percentage.
Beta-Hydroxybutyrate Excretion Rate Measurement
The determination of the amount of amount of beta-Hydroxybutyrate being excreted in a biological specimen over a defined period of time (e.g. one hour).
Thymidine Kinase 1 Measurement
The determination of the amount of thymidine kinase 1 in a biological sample.