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Glossary Term

Hemolysis

Disruption of the integrity of the erythrocyte membrane causing release of hemoglobin.

Performance Metrics

Tests

Herpes Simplex Virus 1 and/or 2 Antigen Measurement

The determination of the amount of herpes simplex virus 1 and/or 2 antigen in a biological sample.

For professionals

Tests

Herpes Simplex Virus 1 DNA Measurement

The determination of the amount of herpes simplex virus 1 DNA in a biological sample.

For professionals

Tests

Heterophil Measurement

The determination of the amount of heterophils present in a sample.

For professionals

Glossary Term

Heterozygosity

Having two different allelic forms of a gene, one inherited from each parent, on each of the two homologous chromosomes.

Pcr Terms

Tests

Hippuric Acid Measurement

The determination of the amount of hippuric acid present in a sample.

For professionals

Indicators

A semi-essential amino acid (children should obtain it from food) needed in humans for growth and tissue repair, Histidine is important for maintenance of myelin sheaths that protect nerve cells and is metabolized to the neurotransmitter histamine. Histamines play many roles in immunity, gastric secretion, and sexual functions. Histidine is also required for blood cell manufacture and protects tissues against damage caused by radiation and heavy metals. (NCI04)

Glossary Term

Histone

Major protein component of chromatin. Highly conserved basic proteins, originally classified into classes based on the relative amounts of arginine and lysine in each protein. The various classes are now termed H1, H2A, H2B, H3, and H4. In chromatin, they are found in an octamer, containing two each of H2A, H2B, H3, and H4, complexed with DNA in nucleosomes. The histones in the octamer complex are also known as the core histones. The H1 class of histones, termed the linker histones, is loosely associated with the nucleosome.

Pcr Terms

Tests