Procedures Assays and Normal Values
Taking Blood Samples
This means that blood should always be drawn at about the same time of day and after at least eight hours of fasting, since both circadian rhythm and nutritional status can affect the findings. If strictly comparable values are required, there should also be half an hour of bed rest before the sample is drawn, but this is only practicable in a hospital setting. In other settings (i.e., outpatient clinics), bringing portable instruments to the relaxed, seated patient works well. A sample of capillary blood may be taken when there are no further tests thatwould require venous access for a larger sample volume. Awellperfused fingertip or an earlobe is ideal; in newborns or young infants, the heel is also a good site. If the circulation is poor, the blood flow can be increased by warming the extremity by immersing it in warm water. Introduction to the Physiology and Pathophysiology of the Hematopoietic System
The reason why quantitative and qualitative diagnosis based on the cellular components of the blood is so important is that blood cells are easily accessible indicators of disturbances in their organs of origin or degradation which are much less easily accessible. Thus, disturbances in the erythrocyte, granulocyte, and thrombocyte series allow important conclusions to be drawn about bone marrow function, just as disturbances of the lymphatic cells indicate reactions or disease states of the specialized lymphopoietic organs (basically, the lymph nodes, spleen, and the diffuse lymphatic intestinal organ). |
Article of the DayOld ArticlesThursday, January 15
Newsletter |
Chat Box76.1.94..>:-PLebophyroxin
click here to open the chat window... There are 0 people chatting right now. Forums Infos
| ||||||||
You are not logged in - Member Login - Join Us!