Pipetting is one of the most frequent—and most critical—tasks in any laboratory. Whether you're preparing reagents, performing PCR reactions, or handling sample prep for HPLC, even the smallest volume deviation can distort your results. That’s why accuracy and precision in pipetting are not just preferred—they’re essential for reproducible and reliable results.

In this post, you'll discover:

• Why not all volumes are equal

• How to avoid common pipetting errors

• What to consider when choosing and maintaining pipettes

What Does Accuracy in Pipetting Mean?

In measurement science, we distinguish between two key terms:

• Accuracy: How close is the dispensed volume to the intended target value?

• Precision: How consistent are repeated pipetting actions of the same volume?

Example: If you're pipetting 100 µl and consistently dispense 95 µl, your results are precise, but not accurate.

Why Is Accurate Pipetting So Important?

In many lab applications, even minor inaccuracies can have major consequences:

PCR setups: Incorrect enzyme or primer concentrations → no amplification or unspecific products
ELISA tests: Signal variation → unreliable quantitative data
Titrations: Reagent errors → inaccurate concentration results

Bottom line: Inaccurate pipetting costs time, money—and potentially your results.

Pipette Types & Their Accuracy

💡 Tip: Always choose a pipette suited for your desired volume range. Pipettes perform most accurately in the middle third of their volume range.

Common Pipetting Errors to Avoid

Even the best pipette can produce poor results if misused. Here are the most common errors:

• Holding the pipette at an incorrect angle (more than 20° deviation)

• Not fully immersing the pipette tip

• Aspiration or dispensing too quickly

• Using poor-quality or mismatched tips

• Using an uncalibrated or damaged pipette

🔧 Calibration & Maintenance: Keep Your Pipette Reliable

Regular pipette calibration is essential—ideally every 6 to 12 months, depending on usage. Additional tips:

• Clean the pipette after each use, especially with corrosive or viscous liquids

• Perform regular leak tests (e.g., with distilled water)

• Replace worn seals and pistons regularly

Best Practices for Precise Pipetting

• Pre-warm pipette and liquid to room temperature
• Pre-wet the tip by aspirating and dispensing the liquid several times
• Work slowly and steadily to avoid bubbles or splashes
• Maintain consistent conditions (temperature, humidity) for reproducibility

Conclusion: Precision Is Not a Luxury – It's a Must

Pipetting accuracy is crucial to the success of your experiments. Whether analyzing DNA, running quantitative assays, or preparing pharmaceutical samples—a few microliters can make all the difference.

Regular maintenance, proper technique, and reliable equipment will help you avoid rework, frustration, and unnecessary costs.

❓ Frequently Asked Questions (FAQs)

How often should I calibrate my pipette?
At least once a year. For high-use pipettes, every 6 months is recommended. Regulated labs may require stricter calibration intervals.

Why is the middle third of the pipette volume range most accurate?
Pipettes are technically optimized for maximum precision in the middle third of their volume range (e.g., 60 µl for a 20–100 µl pipette).

What’s the difference between accuracy and precision?

• Accuracy = How close your result is to the true value

• Precision = How consistent your results are across multiple trials

Can I reuse pipette tips?
No—single-use tips are essential to prevent cross-contamination. Only certain autoclavable tips may be reused if permitted by your SOP.

Which pipetting errors only show up later?

• Poor reproducibility in PCR or ELISA

• Inconsistent concentrations in quantitative analyses

• False positives or negatives due to volume deviations

🔧 Did You Know? We Offer Pipette Safety Checks!

Our service includes professional maintenance and calibration of your pipettes according to DIN EN ISO 8655.
📞 Schedule your appointment now: +49 7336 9603 70
📧 Or email us at: service@laborgeraete-sued.de

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