Glossary Term

Positive Control

A control sample that is known to produce a positive result if the test is working as expected.

Product

AccuPlex Monkeypox Positive Reference Material Kit

Technology

Gram Staining Method

This is a method (named after the Danish bacteriologist, Hans Christian Gram) for staining and identifying bacteria. It is based on the differential retention of a crystal violet-iodine complex within the cell membrane. Gram-positive organisms will appear blue-black or purple while Gram-negative organisms will appear red.

Technology

Immunochromatography

A type of chromatography assay in which an antibody-conjugate is passed over an immobilized antigen, giving a visual indication of positive or negative result.

Technology

Internal Control and QC for PCR Testing: Reliability, Inhibition & Documentation

Understand internal, positive, negative and external controls for reliable PCR testing, inhibition monitoring and audit-ready QC workflows.

Article

[Clinicopathological Characteristics of ROS1-positive 
Non-small Cell Lung Cancer Based on Next-generation Sequencing].

Research record from Zhongguo Fei Ai Za Zhi, 2026-05-01. PMID 42452864.

Article

[Expert consensus on the diagnosis, exclusion, and follow-up for newborns with positive genetic screening results by next-generation sequencing (2026 Edition)].

Research record from Zhonghua Yi Xue Yi Chuan Xue Za Zhi, 2026-09-01. PMID 42663019.

Article

[False positives in female testosterone testing and the diagnostic value of mass spectrometry].

Research record from Beijing Da Xue Xue Bao Yi Xue Ban, 2026-04-01. PMID 41978404.

Tests

Abnormal Kappa Positive Plasma Cell to Abnormal Lambda Positive Plasma Cell Ratio Measurement

The determination of the ratio of abnormal kappa positive plasma cells to abnormal lambda positive plasma cells present in a sample. The measurement may be expressed as a ratio or percentage.

Tests

Absolute Helper T Lymphocyte Count

The measurement of the number of helper T lymphocytes, which are T lymphocytes that express CD4, in a cubic millimeter of blood. It is calculated by multiplying 1000 by both the total leukocyte count and the percent of helper T cells in the differential leukocyte count.

Tests

Absolute T Lymphocyte Count

The measurement of the number T lymphocytes, which are leukocytes that express CD3, in a cubic millimeter of blood. It is calculated by multiplying 1000 by both the total leukocyte count and the percent of T cells in the differential leukocyte count.

Article

Accelerated Direct Identification of Gram-Positive and Gram-Negative Bacteria Using Matrix-Assisted Laser Desorption Ionization-Time of Flight Mass Spectrometry (MALDI-TOF MS) in Critically Ill Patients.

Research record from Cureus, 2026-05-09. PMID 42266301.