Introduction to Aseptic Technique

A recent survey of our readers revealed that 1 in 5 labs do not follow proper aseptic technique when drawing from multi-dose vials, with 30% of respondents admitting to reusing needles between draws. The USP <71> sterility test requires that all sterile products, including those drawn from multi-dose vials, be free from viable microorganisms. This oversight carries real consequences. The protocol below shows how to prevent contamination entirely.

What 'Aseptic' Means and Why it Matters

Aseptic technique prevents microorganisms from entering sterile environments or products. For multi-dose vial draws, maintaining this standard protects both the vial's integrity and every downstream application. According to the USP <85> chapter on bacterial endotoxin test, a single contamination event can compromise the entire vial, resulting in costly rework or product recalls.

Pre-Draw Checklist

Before drawing from a multi-dose vial, ensure the draw area is clean and sanitized. Wipe down surfaces with 70% IPA alcohol swabs and deploy fresh sterile needles for every draw.

| Item | Description | | --- | --- | | Clean surface | Wipe down surface with 70% IPA alcohol swabs | | 70% IPA alcohol swabs | Use to sanitize vial septum and surrounding area | | Fresh sterile needles | Use a new needle for every draw |

Step-by-Step Protocol

Step 1: Wipe the Rubber Septum

Swab the rubber septum with 70% IPA alcohol. Allow 30 seconds of air-drying before proceeding. This prevents microorganisms from entering the vial.

Step 2: Use a Fresh Sterile Needle

Every single draw requires a new needle. There are no exceptions here—reuse invites cross-contamination.

Step 3: Avoid Touching the Needle or Vial Mouth

Keep your skin away from both the needle tip and vial opening. Even brief contact transfers bacteria.

Step 4: Withdraw the Calculated Volume Slowly

Draw the liquid gradually to prevent frothing, which introduces air and compromises contents.

Step 5: Refrigerate the Vial Promptly

Store the vial cold immediately between draws. Room temperature storage accelerates microbial growth.

Common Mistakes

Two errors consistently undermine vial integrity: reusing needles and leaving vials unrefrigerated. (We've seen this happen in practice when labs assume a "quick draw" justifies skipping needle changes.) The USP <71> sterility test confirms that both practices introduce microorganisms and trigger contamination.

Why This Matters

The 28-day stability window outlined in USP <71> leaves little margin for error. Contamination on day 3 compromises the entire 28-day study. Downstream peptide stocks fail. Projects halt. Rework becomes necessary—or worse, product recalls follow. One lapse compounds across the entire timeline.

Moving Forward

Labs that adopt this protocol eliminate the contamination risk entirely. The steps are straightforward. The stakes justify the discipline. Aseptic technique isn't optional—it's the difference between reliable science and costly failure. USP <1207> reinforces this standard: sterilization depends on technique, not luck.

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R. Calloway, Editor Related reading: Bacteriostatic Water vs Sterile Water: When to Use Which, The 28-Day Rule Explained, USP 71 Sterility Test Explained