Mention the Laboratory factors which influence ESR.

1.	Mention the Laboratory factors which influence ESR.
Answer» 1. Temperature: ESR is increased at higher temperature 2. Time: The sedimentation is maximum in first 4 hrs. of collection of sample hence test should preferably do within this time. 3. Anticoagulant: Heparin, Oxalate, are not suitable. Citrate in 3.8 percent solution is preferable. 4. Length of the ESR tube: ESR is greater with longer tubes. 5. Inclination of the tube: Deviation from the vertical increases the ESR. A 3-degree tilt from vertical can lead to an increase in ESR by as much as 30%.

Answer»

1. Temperature: ESR is increased at higher temperature

2. Time: The sedimentation is maximum in first 4 hrs. of collection of sample hence test should preferably do within this time.

3. Anticoagulant: Heparin, Oxalate, are not suitable. Citrate in 3.8 percent solution is preferable.

4. Length of the ESR tube: ESR is greater with longer tubes.

5. Inclination of the tube: Deviation from the vertical increases the ESR. A 3-degree tilt from vertical can lead to an increase in ESR by as much as 30%.

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