Key Terms Related to Blood Collection and Microscopy

Chapter 11: Key Terms in Blood Collection and Microscopy

Introduction

This section provides definitions and explanations of essential terms related to blood specimen collection, blood smear preparation, and microscopic examination. Understanding these terms is crucial for laboratory procedures and clinical diagnostics.

Arterialized Capillary Blood

• Definition: Capillary specimens obtained from warmed sites, where increased arterial pressure causes capillaries to fill with a larger volume of arterial blood compared to venous blood.

• Application: Used in laboratory testing when arterial blood is required but direct arterial puncture is not feasible.

Blood Smear/Film/Slide

• Definition: A thin layer of venous blood spread on a microscope slide.

• Purpose: Used in hematology laboratories to detect morphological abnormalities in blood cells.

• Example: Blood smears are essential for diagnosing conditions such as anemia, malaria, and leukemia.

Calcaneus

• Definition: The heel bone, often referenced in pediatric blood collection (heel stick).

Capillary Action

• Definition: The free-flowing movement of blood into a micro collection tube without the use of suction, due to adhesive and cohesive forces in the liquid.

• Application: Important in the collection of small blood samples for laboratory analysis.

Cyanotic

• Definition: Bluish discoloration of the skin or mucous membranes due to oxygen deficiency in the blood.

• Clinical Significance: Indicates hypoxemia and may require immediate medical attention.

Dehydrated

• Definition: Lacking water or fluid in the body.

• Clinical Relevance: Dehydration can affect blood sample quality and laboratory results.

Feathered Edge (Blood Smear)

• Definition: The thin, curved edge of a blood smear on a microscope slide, where cells are most evenly distributed and best visualized.

• Application: Used to assess cell morphology accurately during microscopic examination.

Interstitial (Tissue) Fluid

• Definition: Naturally occurring liquid found between the gaps/layers of tissue; a small component of capillary blood specimens.

• Significance: May dilute capillary blood samples if excessive tissue fluid is collected.

Peripheral Circulation

• Definition: Refers to blood flow near the surface of the body.

• Clinical Importance: Peripheral circulation is assessed in various diagnostic procedures, including capillary blood collection.