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This page describes products and general use; it is not medical advice.
A 50 mL syringe (also written 50 ml syringe or 50ml syringe) is a piston syringe with a 50 mL barrel capacity. It is the largest size in many general-purpose syringe ranges, and the tip type and graduation printed on the product record are the details that decide whether it fits the connector it is meant to be used with. Who uses it: clinical staff, supply buyers reading product listings, and students learning to read a syringe specification.
What a 50 mL syringe is
In U.S. regulation a syringe of this kind is a piston syringe. 21 CFR 880.5860 defines it as a device intended for medical purposes that consists of a calibrated hollow barrel and a movable plunger. The barrel’s male connector (the nozzle) fits the female connector (the hub) of a hypodermic single-lumen needle, and the device is used to inject fluids into, or withdraw fluids from, the body. The same regulation classifies the piston syringe as Class II (performance standards). The “50 mL” in the name is the fill volume, meaning the nominal capacity of the barrel.
How it is built and labelled
The two parts named in the regulation are the calibrated barrel and the movable plunger, with the nozzle at the tip of the barrel. A manufacturer’s product record then adds the fields that distinguish one 50 mL syringe from another. Two published BD records for a 50 mL Luer-Lok syringe show the pattern:
| Field | BD 309653 (US listing) | BD 300865 (UK listing) |
|---|---|---|
| Capacity / fill volume | 50 mL | 50 mL |
| Tip type | Luer-Lok | Luer-Lok concentric |
| Graduation (scale) | Not listed on the page | 1 mL |
| Supply condition | Sterile, single-use | Sterile, single-use |
| Stated use | General use | Injection of medicinal substances, blood extraction, and aspiration of fluids |
Reading a listing this way is the practical benefit of the table: capacity, tip, scale and sterility are separate fields, and a listing that omits one (as the US record omits graduation) leaves it unconfirmed rather than implied.
Tip types
The tip is the connection point, and it must match the device on the other side. The Luer-Lok tip carries a screw thread so the connector does not come off; this is why Luer-lock syringes are described in the MSF medical catalogue as suited to situations where back pressure is higher or leakage must be avoided. A tip without that thread is a Luer-slip tip. The standard Luer taper used for intravascular and hypodermic connections is specified in ISO 80369-7; other small-bore connector families (enteral and neuraxial) are deliberately made incompatible with it so that tubing cannot be misconnected.
| Tip | What the source says |
|---|---|
| Luer-Lok | Screw thread keeps the connector from coming off (MSF catalogue). Listed for BD 309653 and BD 300865 (BD). |
| Luer-slip | Tip without the screw thread; the contrast with the lock type is drawn in the MSF catalogue. |
What “single-use” and “sterile” mean on the label
The MSF catalogue defines single-use as intended for use on one patient during a single procedure, and states the device is not to be reprocessed. A sterile device is supplied sterile and must remain sterile until its use. Both BD records above are labelled sterile, single-use. Our guide on whether syringes expire covers date markings on packaging.
Safe use and handling basics
- Treat a syringe labelled single-use as single-use: one patient, one procedure, no reprocessing.
- Keep the device in its sterile packaging until it is needed, because it must stay sterile until use.
- Match the syringe tip to the connector it will be joined to; do not assume that every syringe tip fits every device.
- Follow the manufacturer’s instructions for use for the specific product and your facility’s policies.
Common mistakes
- Assuming “50 mL” says anything about the tip: the tip type is a separate field on the product record.
- Assuming the scale is the same on every 50 mL syringe: the UK BD record states a 1 mL scale, but the field varies by product and should be read from the listing.
- Treating a general-use syringe as interchangeable with a specialist one; for comparison see the low dead space syringe guide.
Related syringe guides
For a smaller size, see the 20 mL syringe guide. For a manufacturer-specific overview, see BD syringes, and for a different syringe class, what a subcutaneous syringe is.
FAQ
Is a 50 ml syringe the same as a 50ml syringe?
Yes. 50 ml, 50 mL and 50ml are spelling variants of the same 50 millilitre capacity; the manufacturer records cited here write it as 50 mL.
What regulatory class is a piston syringe in the United States?
Class II (performance standards), under 21 CFR 880.5860.
Are 50 mL syringes sterile and single-use?
The BD 50 mL Luer-Lok records cited here are labelled sterile and single-use. Check the label of the specific product you have.
Sources
- 21 CFR 880.5860, Piston syringe, eCFR: ecfr.gov (read 2026-11-08).
- BD 309653, 50 mL Luer-Lok syringe: bd.com US product page (read 2026-11-08).
- BD 300865, 50 mL Luer-Lok syringe: bd.com UK product page (read 2026-11-08).
- MSF medical catalogue (single-use, sterile, Luer-lock wording): unicat.msf.org (read 2026-11-08).
