CoaguChek XS 24 PT Test Strips

What Are CoaguChek XS Test Strips and How Do They Help?

If you're managing long-term anticoagulation therapy — most commonly with warfarin — keeping a close eye on your INR (International Normalised Ratio) is essential. Too low and you risk clotting; too high and bleeding becomes a real concern. CoaguChek XS test strips give you the ability to check your PT/INR result from the comfort of your own home, using just a small fingerstick blood sample. Each pack contains 24 single-use strips, compatible exclusively with the Roche CoaguChek XS meter. At £104.99, this pack represents a practical investment for anyone on long-term warfarin therapy who wants greater independence between clinic visits.

Warfarin is one of the most commonly prescribed anticoagulants in the UK, used to prevent blood clots in conditions such as atrial fibrillation, deep vein thrombosis, and following heart valve replacement. The NHS recommends regular INR monitoring to keep patients within their therapeutic range. Home testing with CoaguChek XS test strips has been shown to support this, and many NHS anticoagulation services actively encourage self-monitoring for suitable patients. You can also explore our electrical health and diagnostic range for other monitoring devices.

How Do CoaguChek XS PT Test Strips Work?

The science behind these strips is straightforward, though the engineering is precise. Each strip contains a dried thromboplastin reagent — a substance that initiates the clotting cascade when it comes into contact with blood. Here's what happens during a test:

• You insert the strip into the CoaguChek XS meter, which automatically powers on.
• The meter prompts you to apply a blood sample when ready.
• A small drop of capillary blood (from a fingertip lancet prick) is applied to the strip's sample application zone.
• The thromboplastin reagent triggers clot formation within the blood sample.
• The meter detects the change in blood movement caused by clotting and calculates the prothrombin time (PT).
• This is automatically converted to an INR value, displayed on screen within approximately one minute.

The result reflects how quickly your blood clots relative to a standard reference — which is exactly what your anticoagulation team needs to know to adjust your warfarin dose safely.

Who Should Use CoaguChek XS PT Test Strips?

These strips are intended for adults who are already established on warfarin therapy and have been trained in self-monitoring by a healthcare professional. They are not suitable for initial anticoagulation management or for monitoring other anticoagulant medicines. Suitable users include:

• Adults taking warfarin for atrial fibrillation, DVT, pulmonary embolism, or mechanical heart valves
• Patients who have completed a self-monitoring training programme with their anticoagulation clinic
• Those who find frequent clinic visits difficult due to mobility, distance, or work commitments
• Patients whose GP or anticoagulation service has approved home INR testing

Children and patients who have not been trained in self-testing should not use this device without direct clinical supervision. Always share your home INR results with your healthcare team — home testing supports, but does not replace, professional clinical oversight.

How Do CoaguChek XS Strips Compare to Clinic-Based INR Testing?

How Should You Store CoaguChek XS Test Strips?

Proper storage is critical to getting accurate results. Each strip is individually sealed in a foil pouch to protect the reagent from moisture and temperature fluctuations. Store your CoaguChek XS test strips between 2°C and 32°C — a cool, dry cupboard away from direct sunlight is ideal. Do not store them in the fridge unless the ambient temperature in your home regularly exceeds 32°C, and never freeze them. Once a pouch is opened, the strip must be used immediately; do not attempt to reseal and reuse.

Check the expiry date on each individual pouch before testing. Using an expired strip can produce inaccurate INR readings, which could have serious clinical consequences for anyone on warfarin. If you're also managing other health conditions alongside anticoagulation, our vitamins and supplements collection may be of interest — though always check with your pharmacist before starting any supplement while on warfarin, as many can affect INR.

This product is a medical device. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

What Are CoaguChek XS 24 PT Test Strips and What Are They Used For?

CoaguChek XS 24 PT Test Strips are single-use in vitro diagnostic (IVD) test strips manufactured by Roche. They are used exclusively with the Roche CoaguChek XS meter to measure prothrombin time (PT) and calculate the International Normalised Ratio (INR) from a small capillary blood sample obtained by fingerstick. They are intended for self-monitoring of oral anticoagulation therapy — specifically warfarin — in adults who have been trained by a healthcare professional.

Warfarin works by inhibiting vitamin K-dependent clotting factors. Because its effect varies between individuals and can be influenced by diet, illness, and other medicines, regular INR monitoring is essential to ensure the dose keeps you within your therapeutic range. The NHS supports self-monitoring for appropriate patients as part of a structured anticoagulation management programme.

What Do You Need to Know Before Using CoaguChek XS Test Strips?

These strips are a medical device, not a medicine. However, there are important contraindications and precautions to be aware of before use.

Do not use these strips if:

• You are not currently taking warfarin — these strips are not validated for DOACs (e.g. rivaroxaban, apixaban, dabigatran)
• You have not been trained in self-monitoring by a qualified healthcare professional
• The strip's individual foil pouch is damaged, open, or the strip has passed its expiry date
• You are using a meter other than the Roche CoaguChek XS
• You have a haematocrit outside the range of 25–55% (the meter may give inaccurate results)

Warnings and precautions:

• Home INR results should always be shared with your anticoagulation team or GP — do not adjust your warfarin dose independently without clinical guidance
• Certain medicines can affect your INR, including antibiotics, antifungals, aspirin, NSAIDs, and some herbal remedies such as St John's Wort
• Dietary changes — particularly involving vitamin K-rich foods like leafy green vegetables — can alter your INR
• Illness, especially with fever or diarrhoea, can affect warfarin metabolism and INR stability
• Always perform a quality control check with the CoaguChek XS control solution periodically to verify meter accuracy

Known interactions (medicines affecting INR):

• Antibiotics (e.g. metronidazole, ciprofloxacin) — may increase INR
• Antifungals (e.g. fluconazole) — may increase INR
• Aspirin and NSAIDs — increase bleeding risk
• St John's Wort — may decrease INR
• Amiodarone — may significantly increase INR

How Should You Use CoaguChek XS PT Test Strips?

Always follow the instructions provided with your CoaguChek XS meter and the strip packaging. The general procedure is as follows:

1. Wash and dry your hands thoroughly before testing.
2. Remove one strip from its individual foil pouch immediately before use — do not open pouches in advance.
3. Insert the strip into the CoaguChek XS meter; the meter will switch on automatically.
4. Wait for the flashing blood drop symbol to appear on the meter screen.
5. Use a lancet to prick the side of your fingertip and allow a small blood drop to form.
6. Touch the blood drop to the edge of the strip's sample application zone — do not smear.
7. Hold still while the meter processes the sample (approximately 60 seconds).
8. Read your INR result on the screen and record it in your anticoagulation diary or app.
9. Dispose of the used strip and lancet safely in a sharps container.

What Are the Possible Side Effects of Using CoaguChek XS Test Strips?

As a medical device rather than a medicine, CoaguChek XS test strips do not cause systemic side effects. However, the fingerstick procedure itself can occasionally cause minor discomfort. If you're managing multiple health conditions and looking for other health products, our first aid collection includes lancets, plasters, and wound care essentials.

Common effects associated with fingerstick testing:

• Mild soreness or tenderness at the puncture site
• Minor bruising around the fingertip
• Small amount of bleeding that resolves quickly with gentle pressure

Less common concerns:

• Infection at the puncture site if lancet hygiene is not maintained — always use a new, sterile lancet for each test
• Inaccurate readings if the strip is expired, damaged, or used with an incompatible meter — this is a device error, not a physiological side effect, but it carries clinical risk

How Should You Store CoaguChek XS 24 PT Test Strips?

• Store between 2°C and 32°C in a cool, dry location away from direct sunlight
• Do not freeze the strips under any circumstances
• Keep strips in their individual foil pouches until the moment of use
• Do not use strips after the expiry date printed on the pouch or outer carton
• Keep out of reach of children
• Do not store in a bathroom or near sources of moisture or heat
• Once removed from the foil pouch, the strip must be used immediately — it cannot be stored for later use

If you are travelling and need to transport your strips, keep them in their original packaging and avoid leaving them in a hot car or direct sunlight. Our travel health range includes useful accessories for patients managing health conditions on the go.