Hemoglobin is the main component of Red Blood Corpuscles (RBC's). Hemoglobin is a conjugated protein that "carries" oxygen and transports it to all the body cells. Hemoglobin also carries carbon dioxide from the tissues to the lungs for excretion. Three major types of hemoglobin are found in normal blood; they are: Hgb A, Hgb A2, and Hgb F.
Histology is the study of the microscopic structure of tissues and cells. Histology technicians prepare frozen sections and surgical and autopsy tissues by slicing them to less than paper thickness, mounting them on slides, and finally staining them with special dyes. The slides will then be examined and interpreted, usually by a pathologist.
The study of disease, its nature and cause.
Plasma is the liquid portion of whole blood after centrifuging. Whole blood is spun in a centrifuge removing the solid portions of the blood, such as red and white blood cells and other solid particles. The plasma is thick and rich with dissolved elements and other substances such as proteins and minerals.
The term random, refers to taking a sample (any sample) at any time during the day (or night). Random means that you do not have to take the sample at a particular time. Sometimes the sample may have other stipulations. You might have to take the sample on a certain day. If the test is ordered today, you generally take the sample today (unless ordered differently).
First Voided Specimen (First morning specimen)
As the name implies, the first specimen of the day is to be obtained. However, some facilities insist the specimen be at a certain time in the morning. Be sure to check policy at your facility.