Multi-Sample Needles vs Butterfly Needles: Which Is Better for Blood Collection?

When it comes to blood collection, choosing the right needle is more than a matter of preference — it impacts sample quality, patient comfort, staff safety, and overall procedure cost. Two of the most commonly used devices are the multi-sample needle and the butterfly needle (winged infusion set). While both serve the same fundamental purpose of accessing a vein to draw blood, their designs and ideal use cases differ significantly.

In this guide, we break down the key differences between these two phlebotomy tools and help you determine which one is right for your clinical setting.

What Is a Multi-Sample Needle?

A multi-sample needle is a rigid, double-ended needle designed to be screwed into a standard tube holder (also called a barrel or adapter). One end pierces the patient's vein; the other end, covered by a self-sealing rubber sleeve, penetrates the stopper of an evacuated blood collection tube.

The key advantage is in the name: it allows multiple tubes to be filled from a single venipuncture. When one tube is removed, the rubber sleeve automatically reseals, preventing blood leakage while the next tube is inserted.

Key characteristics:

Rigid, straight design with no flexible tubing

Screws directly into a tube holder

Compatible with all standard vacuum collection tubes

Available in 18G–23G, with color-coded hubs

Lower per-unit cost

Fast procedure time for multi-tube draws

What Is a Butterfly Needle?

A butterfly needle, also known as a winged infusion set, features a small needle attached to two flexible plastic "wings" and a length of thin tubing. The tubing terminates in either a luer connector (for syringe use) or a multi-sample luer adapter (for vacuum tube use).

The wings give the phlebotomist greater control and stability during insertion, and the flexible tubing allows the needle to remain in the vein while the collection apparatus is manipulated.

Key characteristics:

Small, lightweight needle with flexible wings

Flexible tubing (typically 180–300 mm)

Available with luer slip, luer lock, or multi-sample adapter

Most common gauges: 21G, 23G, 25G

Better control for small or fragile veins

Slightly higher per-unit cost

Multi-sample Needle Vs Butterfly Needle

When to Use a Multi-Sample Needle

The multi-sample needle is the workhorse of routine phlebotomy and is the preferred choice in most standard situations.

Ideal scenarios:

Routine adult venipuncture with accessible, well-defined veins

Multi-tube collections where several tubes are needed in one draw (e.g., comprehensive metabolic panels, CBC, coagulation studies)

High-volume laboratories and hospital phlebotomy departments where speed and cost efficiency matter

Blood banks and donation centers where flow rate is important

Standard outpatient collections on patients with normal vein condition

Why it works well here: The rigid design and direct tube connection mean faster tube changes and less blood wasted in tubing. For a typical 4–6 tube draw, the multi-sample needle is both faster and cheaper than a butterfly.

When to Use a Butterfly Needle

The butterfly needle excels in situations where vein access is challenging or where the standard rigid needle is impractical.

Ideal scenarios:

Pediatric patients — small veins, and the shorter needle length reduces the risk of over-penetration

Elderly patients — fragile, rolling veins that require precise, shallow insertion

Obese patients — where the angle of insertion needs careful adjustment

Patients with small or difficult veins — including those undergoing chemotherapy or with chronic illness

Neonates and infants — typically using 23G or 25G

Hand and wrist veins — where a rigid needle would be awkward to position

Syringe draws — when vacuum tubes are not suitable or when a controlled, manual draw is needed (e.g., for patients with fragile veins that might collapse under vacuum)

Patients with anxiety or needle phobia — the smaller visual profile and gentle insertion can be less intimidating

Why it works well here: The wings allow the phlebotomist to hold the needle at a very shallow angle with precise control. The flexible tubing means the needle stays steady even when tubes or syringes are being changed — critical when working with a vein that is difficult to keep accessed.

Patient Comfort: Does One Hurt Less?

This is one of the most common questions from patients. The answer depends on gauge and technique more than device type.

A 21G multi-sample needle and a 21G butterfly needle have the same needle diameter, so the initial puncture sensation is comparable.

However, butterfly needles are more commonly used in smaller gauges (23G, 25G), which many patients report as less painful.

The shorter needle length of butterfly needles (½" to ¾") means less tissue penetration, which can improve comfort, especially in thin patients or children.

The flexible tubing reduces the chance of the needle shifting or "tenting" the vein during tube changes, which can cause discomfort or vein damage.

For routine adult draws with good veins, patient comfort is similar. For difficult-access patients, the butterfly is generally the more comfortable option.

Sample Quality Considerations

Hemolysis — the rupture of red blood cells — is a major concern in blood collection, as it can invalidate test results (especially potassium, LDH, and hemoglobin assays).

Multi-sample needles: The larger gauges (20G, 21G) and direct vacuum flow generally produce good-quality samples. However, using too small a gauge (22G, 23G) with high vacuum pressure can increase hemolysis risk.

Butterfly needles: The smaller gauges and narrower tubing can create higher shear forces, potentially increasing hemolysis if drawn too quickly. Best practice is to draw slowly and gently, especially with 23G and 25G butterflies. The tubing also introduces a small dead volume — blood that remains in the tubing and is not collected, which can be a concern for very small-volume pediatric draws.

Important: When using a butterfly needle with vacuum tubes, the first tube drawn should be a discard tube (or a non-additive tube) to clear the tubing air and prevent under-filling of additive tubes. This is not necessary with a standard multi-sample needle.

Safety: Needlestick Injury Prevention

Both device types are available in safety-engineered versions, and the choice between them should not compromise staff safety.

Safety multi-sample needles: Feature a sliding shield or hinged guard that covers the needle immediately after withdrawal. Activated with one hand, often with an audible click.

Safety butterfly needles: Feature retractable needles or wing-mounted shields that activate after use. Some designs automatically retract the needle into the tubing hub.

Both types, when used correctly, significantly reduce the risk of accidental needlestick injuries. The choice comes down to clinical preference and the specific procedure. Healthcare facilities in many regions are required to use safety-engineered devices by law (e.g., EU Directive 2010/32/EU, U.S. OSHA Bloodborne Pathogens Standard).

Cost Analysis

For high-volume laboratories, cost per draw adds up quickly.

Multi-sample needles: Typically the lower-cost option. A standard 21G multi-sample needle costs significantly less per unit than a comparable butterfly.

Butterfly needles: The additional material (wings, tubing, connector) increases per-unit cost by roughly 2–4x compared to a standard multi-sample needle. Safety butterflies are even more expensive.

However, cost should not be the only factor. A failed draw with a multi-sample needle on a difficult-access patient — requiring a second stick, additional tubes, and patient dissatisfaction — can end up costing more than using a butterfly from the start.

Best practice: Use multi-sample needles for routine, high-volume draws, and reserve butterflies for patients with difficult venous access or specific clinical indications. This balances cost efficiency with patient care quality.

Quick Decision Guide

Conclusion

There is no universally "better" needle — the right choice depends on the patient, the vein, the number of tubes, and the clinical setting.

Choose a multi-sample needle for routine adult draws, multi-tube collections, and high-volume settings where speed and cost efficiency are priorities.

Choose a butterfly needle for pediatric, geriatric, and difficult-access patients, when a syringe draw is needed, or when precise shallow insertion is required.

Many experienced phlebotomists carry both and make the decision at the bedside after assessing the patient's veins. The goal is always the same: a clean, single-stick draw that yields a high-quality sample with minimal patient discomfort.

Related Reading

1. Blood Lancets Market Trends 2026 | How to Choose Safe Blood Lancets

2. Diabetes: Causes, Prevention, Blood Glucose Monitoring and Lancets in Diabetes Care

3. Latex Gloves vs Vinyl Gloves vs Nitrile Gloves: Key Differences Comparison