5 Must-Do Lab Safety Checks Before Starting Any Pharmaceutical Experiment

Every morning I walk into the lab and feel that familiar mix of excitement and caution. The excitement comes from the promise of a new discovery, the caution from the memory of the time I almost spilled a bottle of hot solvent because I skipped a quick safety glance. That close call reminded me why a short safety checklist is worth more than a dozen hours of work later. Below are the five checks I never start a pharma experiment without.

1. Put on the Right PPE – It’s Not Just a Fashion Statement

Personal protective equipment, or PPE, is the first line of defense between you and a chemical surprise. In our lab we use lab coats, safety glasses, nitrile gloves, and sometimes face shields.

• Lab coat: Choose a coat that is flame‑resistant and long enough to cover your torso. A short coat can leave your skin exposed to splashes.
• Gloves: Match the glove material to the chemicals you’ll handle. Nitrile works for most organics, but if you’re dealing with strong acids, a thicker, acid‑resistant glove is better.
• Safety glasses: Wrap‑around styles protect against side splashes. If you’re using a fume hood, a face shield adds an extra layer.

A quick tip: before you start, do a “glove‑check” – pull the glove inside out and look for tears or punctures. I once grabbed a pair that looked fine, only to discover a tiny pinhole that let a drop of dimethyl sulfoxide seep through. The lesson? A five‑second glance saves a whole day of decontamination.

2. Verify Equipment Calibration and Integrity

A calibrated balance, a working centrifuge, or a properly set temperature controller can mean the difference between a clean result and a failed batch.

• Balances: Tare the balance with a clean container and verify the reading with a known weight. If the balance drifts by more than 0.1 mg, recalibrate or call maintenance.
• Pumps and dispensers: Check that the flow rate matches the set value. A loose tubing connection can cause under‑dosing, which in pharma can affect potency.
• Glassware: Inspect for cracks or chips. Even a small hairline crack can cause a leak under pressure.

When I was a graduate student, I once trusted a pH meter that had not been calibrated in weeks. The meter read 7.2, but the solution was actually at 5.8, leading to a batch that failed stability testing. A quick calibration with a fresh buffer would have caught that.

3. Confirm Chemical Inventory and Review SDS

Before you reach for a bottle, make sure you know exactly what’s inside and how it behaves.

• Inventory check: Verify that the bottle you plan to use is the correct lot number and that the label matches the intended compound. Mislabelled bottles are more common than we think.
• Safety Data Sheet (SDS): Every chemical must have an up‑to‑date SDS on file. The SDS tells you about hazards, first‑aid measures, and proper disposal. Keep a printed copy at the bench or have it open on a tablet.

I recall a time when I grabbed a bottle of “acetone” that turned out to be a mixture with a small amount of chloroform. The SDS for pure acetone didn’t warn about the respiratory risks of chloroform, and I inhaled a bit more than I should have. A quick glance at the SDS would have flagged the unexpected additive.

4. Ensure Proper Ventilation – Test the Fume Hood

Most pharma work involves volatile or toxic compounds, so a functioning fume hood is non‑negotiable.

• Face velocity test: Hold a piece of paper at the opening; it should be pulled gently toward the hood at about 100 feet per minute. If the paper flutters away, the hood is not pulling enough air.
• Sash position: Keep the sash at the recommended height (usually 18 inches). Raising it too high reduces the hood’s protective airflow.
• Filters: Check that HEPA or carbon filters are within service life. A clogged filter can cause back‑flow of contaminants.

A colleague once left the sash fully open while measuring a volatile ester. The hood’s airflow dropped, and the ester vapor spread across the bench, triggering the alarm. The lesson: a simple paper test before you start can keep the whole lab breathing easy.

5. Review Emergency Procedures and Spill Kits

Even with the best preparation, accidents happen. Knowing what to do before the alarm sounds can save time and health.

• Locate the nearest eye wash station and safety shower: Make sure the path is clear.
• Check the spill kit: Verify that the kit contains absorbent pads, neutralizing agents, and proper waste containers for the chemicals you’ll use.
• Know the evacuation route: Walk the route once a month; it’s easy to forget a door that’s usually locked.

I once had a small spill of a strong acid on the bench. Because I had just refreshed my memory of the spill kit location, I was able to neutralize the acid with the right agent within seconds, preventing damage to the bench and a nasty skin burn.

Putting these five checks into a quick mental routine takes less than two minutes, but it builds a culture of safety that protects you, your teammates, and the data you work so hard to generate. In pharma, where a single error can ripple into costly delays, a disciplined safety start is the smartest experiment you can run.