The Different Types of Tourniquets and Their Purposes
, by Andrew Odgers, 9 min reading time
Device Types
The Different Types of Tourniquets and Their Purposes
Tourniquets used in clinical settings fall into distinct categories based on their design and intended purpose. The flat latex strap used for phlebotomy, the self-releasing buckle tourniquet used in busy clinics, and the combat application tourniquet used in emergency haemorrhage control are all called tourniquets but are designed for entirely different clinical roles. Understanding each type helps ensure the right device is chosen for the right application.
Phlebotomy and venous access tourniquets
Devices designed for routine blood collection and IV access
Flat latex and latex-free straps
The most widely used tourniquet in clinical settings is a flat elastic strap, typically 2 to 4 cm wide and 40 to 50 cm long, made from latex or a latex-free alternative such as nitrile or thermoplastic elastomer. It is applied by wrapping around the limb and tucking one end under the wrapped section, or by a simple loop-and-tuck technique. Release is achieved by pulling the tucked end. Flat straps are inexpensive, available in single-use disposable formats, and provide adequate venous occlusion for routine phlebotomy. Latex-free alternatives are essential for patients with known or suspected latex allergy.
Buckle and clip closure tourniquets
Buckle tourniquets use a plastic locking buckle or clip mechanism rather than a loop-and-tuck. The buckle provides a more consistent application tension and a faster, one-handed release. They are favoured in high-throughput settings such as phlebotomy departments and blood donation clinics where speed and consistency of application are operationally important. Most buckle tourniquets are reusable and made from latex-free materials.
Self-releasing and magnetic closure tourniquets
Self-releasing tourniquets incorporate a mechanism that releases automatically when a specific tension is reached or after a set time interval, or that releases with a single-handed pull without requiring the phlebotomist to remove their hands from the needle or collection equipment. These designs reduce the risk of the tourniquet remaining on too long during difficult collections and are useful in training environments.
Specialist and emergency tourniquets
Devices for applications beyond routine venepuncture
Surgical and orthopaedic pneumatic tourniquets
Pneumatic tourniquets are cuff-based devices inflated to a precise pressure using a pump. They are used in surgical settings to create a bloodless operative field by occluding arterial as well as venous flow to a limb. Pneumatic tourniquet pressure is set above systolic blood pressure, typically 50 to 100 mmHg above the limb occlusion pressure. These are entirely different devices from phlebotomy tourniquets and require specialist training and monitoring of inflation pressure and application time.
Combat application tourniquets (CAT) and SOFTT-W
Emergency haemorrhage control tourniquets including the Combat Application Tourniquet (CAT) and SOFTT-W are designed for single-handed self-application in trauma situations to control catastrophic limb haemorrhage. They work by windlass tightening to the point of arterial occlusion. These are clinical emergency devices and are not appropriate for phlebotomy use. Their presence in first aid kits and trauma bags is a separate application from all routine clinical tourniquet use.
Paediatric tourniquets
Paediatric tourniquets are narrower and shorter versions of standard phlebotomy straps, designed for application to smaller limb circumferences without excessive compression across the width of the limb. Using an adult tourniquet on an infant's arm creates uneven pressure distribution. Purpose-designed paediatric tourniquets provide more consistent venous occlusion in children.
All tourniquet types in stock
Latex-free phlebotomy tourniquets in single-use and reusable formats
Charles Medical supplies latex-free disposable and reusable tourniquets for phlebotomy and clinical venous access. Next-day UK delivery.
For guidance on selecting between reusable and disposable types, see Reusable vs Disposable Tourniquets: Which Is Better.
Part of the hub
Back to the Tourniquets Knowledge Hub
This article is part of our complete tourniquet knowledge base, covering application technique, pressure, timing, device selection, reusable versus disposable, and everything phlebotomists and clinical staff need to know for safe and effective venous access.
Keep reading
Related guides in this hub
Reusable vs Disposable Tourniquets: Which Is Better covers the infection control and cost implications of each format. How to Choose the Right Tourniquet for Clinical Use applies the type knowledge here to specific clinical scenarios. And Tourniquet Pressure Explained covers how different designs affect the pressure applied to the limb.
Frequently asked
Tourniquet type questions answered
What type of tourniquet is used for phlebotomy?
A flat elastic strap, either latex or latex-free, is the standard for routine phlebotomy. Buckle closure designs are also widely used. Both are available in single-use disposable and reusable formats. Latex-free is recommended for all clinical settings due to the risk of unidentified latex allergy in patients.
Can I use a combat tourniquet for blood collection?
No. Combat application tourniquets are designed for arterial occlusion in haemorrhage control and apply far more pressure than is appropriate for venous access. Using one for phlebotomy would cause significant patient harm. Use only phlebotomy-specific tourniquets for venous access and blood collection.
What is a latex-free tourniquet made from?
Latex-free phlebotomy tourniquets are typically made from nitrile, thermoplastic elastomer, or other synthetic rubbers that provide similar elasticity and pressure characteristics to latex without the protein allergens responsible for latex sensitivity reactions.
Do I need a different tourniquet for paediatric patients?
Paediatric-specific tourniquets are available and are narrower and shorter than adult designs to provide appropriate pressure distribution on smaller limbs. In practice, many phlebotomists use standard adult tourniquets applied with a shorter wrap on paediatric patients, but purpose-designed paediatric tourniquets provide more consistent results particularly in infants.