Practice Makes Perfect — About That First Blood Draw

There is a moment every new intern experiences — usually early in their first week — when a nurse looks at you and says, “The patient needs a blood draw. The phlebotomist has already tried twice.” And then they hand you the supplies.

This is your moment.

Your hands may be slightly unsteady. You may be acutely aware that a real human being is lying in that bed trusting you. You will almost certainly feel like an imposter. That is completely normal — and it passes faster than you think.

Here is everything I wish someone had told me before my first blood draw.

Before You Touch the Patient

Gather everything you need first. Nothing breaks a patient’s confidence faster than a nervous intern leaving the room twice to get forgotten supplies. Before you approach the bedside, make sure you have: the correct vacutainer tubes (check the order), a tourniquet, alcohol swabs, gauze, a bandage, gloves, and a needle or butterfly set. Know which tubes you need and in what order to draw them.

Introduce yourself and explain what you’re doing. “Hi, my name is Dr. Cheng. I’m going to draw some blood from your arm today. Have you had blood drawn before? I’ll let you know what I’m doing each step.” This takes thirty seconds and makes an enormous difference in patient comfort — and in your own composure.

Ask about difficult veins. Patients often know their own veins better than you do. “Do you have a side that tends to work better?” or “Has anyone told you that you have difficult veins?” This information is genuinely useful and patients appreciate being asked.

Position the patient properly. Arm extended, slightly supinated (palm up), resting on a flat surface. A relaxed arm is easier to draw from than a tense one.

Finding the Vein

Apply the tourniquet two to three inches above the intended site. Ask the patient to make a fist — this engorges the veins. Give it fifteen to thirty seconds.

The antecubital fossa (inside of the elbow) is your first choice. The median cubital vein — the one that crosses the antecubital fossa diagonally — is usually the most accessible. Look and palpate before you commit. A vein you can feel is more reliable than one you can only see.

If you can’t find a vein in the antecubital fossa, move to the forearm or the back of the hand. Hand veins are more painful but often visible and accessible. Avoid the wrist (radial artery is nearby) and the inner wrist.

Use your fingers, not just your eyes. Palpate along the vein — it should feel like a soft, bouncy cord under your finger. A vein that bounces when you press it is a vein you can draw from.

If veins are difficult to find: Apply a warm compress for five to ten minutes — warmth dilates superficial veins. Let the arm hang dependently for a minute. Try tapping or lightly rubbing the site. Consider a butterfly needle, which gives you more control at a shallower angle.

The Draw

Clean the site with an alcohol swab and let it dry completely. Don’t blow on it, fan it, or touch it after cleaning.

Hold the skin taut below the intended puncture site with your non-dominant thumb — this anchors the vein and prevents it from rolling.

Bevel up. Insert the needle at a 15–30 degree angle, advancing slowly until you see the flash of blood in the hub. At that point, lower the angle slightly and advance a few more millimeters to ensure you’re fully in the vein.

Attach your first vacutainer tube. The vacuum will pull the blood automatically — don’t push. Hold the needle completely still while tubes are filling. Movement is the most common cause of a failed draw after successful entry.

Fill tubes in the correct order of draw (EDTA tubes last, coagulation tubes before other additives — check your institution’s protocol). Gently invert additive tubes immediately after filling.

Release the tourniquet before you withdraw the needle.

When It Doesn’t Go Well

It won’t always go well. That is not a reflection of your competence — it is a reflection of how variable human anatomy is.

If you don’t get a flash after advancing: stop. Don’t dig. Withdraw slightly and redirect — or withdraw completely and try a new site. One redirect attempt per needle is reasonable. Beyond that, use a fresh needle.

If the flow stops mid-draw: the needle may have shifted. Don’t advance further. A small, slow withdrawal sometimes re-establishes flow. If not, abandon the site and use a new one.

Know when to ask for help. Two failed attempts is a reasonable threshold to hand off to a more experienced colleague, a senior resident, or a nurse with known expertise in difficult draws. This is not failure — it is good judgment. Every patient deserves a successful draw with minimal trauma, and egos don’t belong in that calculation.

After the Draw

Apply gentle pressure with gauze immediately after withdrawal — ask the patient to hold it if they’re able. One to two minutes of pressure prevents a hematoma. Instruct them not to bend the arm, which traps blood in the tissue.

Label your tubes at the bedside, immediately and correctly. Mislabeled specimens cause delays, repeat draws, and patient safety events. This step is not optional.

Dispose of your sharps in the sharps container — never recap a used needle. Wash your hands.

Check in with the patient: “Are you doing okay? Any pain?” A brief moment of acknowledgment after the procedure closes the interaction with care.

Getting Better

Phlebotomy is a procedural skill, which means repetition is everything. The first five draws are hard. The next twenty are easier. By the time you’ve drawn blood a hundred times, your hands know what to do before your brain has caught up.

Seek out opportunities to practice early. Volunteer for blood draws on your service. Ask your senior resident or attending if you can observe when a difficult draw is anticipated. Watch how experienced nurses approach veins you couldn’t find.

And when you get it — when the flash of blood appears in the hub after a clean single-stick — there is a small but real satisfaction in that. A skill that belongs to you, earned by practice, that will serve your patients for the rest of your career.

That’s what medicine is made of.

— Dr. Joyce Cheng, MD, MPH, MHA, FACP, Internal Medicine Hospitalist | Clinical Assistant Professor

This article is for general educational purposes only. It does not constitute personal medical advice. Please consult your physician with any questions or concerns.

Medical Disclaimer: This article is intended for general educational purposes only and does not constitute medical advice. It is not a substitute for professional medical evaluation, diagnosis, or treatment. If you are experiencing a medical emergency, call 911 or go to your nearest emergency room.