Preanalytical conditions that affect coagulation testing, including hormonal status and therapy

Area of Science:

• Clinical Chemistry
• Hematology
• Laboratory Medicine

Background:

• Preanalytical conditions significantly influence coagulation factor levels.
• Physiologic and exogenous factors can cause transient or persistent changes in coagulation.
• Accurate laboratory testing requires careful consideration of these preanalytical variables.

Purpose of the Study:

• To highlight the impact of preanalytical conditions on coagulation factors.
• To identify key factors affecting coagulation testing.
• To provide guidance for standardized laboratory testing conditions.

Main Methods:

• Review of existing literature on preanalytical variables and coagulation.
• Analysis of factors including physical/mental stress, diurnal variation, hormone levels, and posture.
• Synthesis of data to identify trends and potential guidelines.

Main Results:

• Preanalytical conditions demonstrably alter coagulation factor levels.
• Factors like stress, posture, and diurnal variations are confirmed to affect results.
• Existing research shows variability and some conflicting findings.

Conclusions:

• Preanalytical conditions are critical and must be controlled for accurate coagulation testing.
• Standardized guidelines for blood drawing and patient handling are necessary.
• Further research may be needed to resolve conflicting data and refine testing protocols.