Tandem t:slim X2 with Basal-IQ Technology: A Complete Guide for People with Diabetes

Last Updated on August 13, 2025

Managing blood sugar is a daily job, and the right tools can make it easier. The Tandem t:slim X2 insulin pump with Basal-IQ™ works with the Dexcom® G6 Continuous Glucose Monitoring (CGM) system to help prevent low blood sugars and simplify care. This guide explains how it works, what’s new, and how it compares to other pumps—so you can decide whether it fits your life.

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What is the Tandem t:slim X2 with Basal-IQ, and why does it matter?

The t:slim X2 is a small, wearable device that delivers insulin throughout the day. Its Basal-IQ feature uses Predictive Low-Glucose Suspend (PLGS) to reduce lows. When the system predicts your glucose will drop below 80 mg/dL in the next 30 minutes, it pauses insulin. When glucose starts rising, it resumes—automatically.

When paired with Dexcom G6, no fingersticks are required for calibration or mealtime dosing. If readings don’t match how you feel, check with a meter before treating. The pump is cleared for people 6 years and older, and it can also be used as a standard insulin pump without Basal-IQ if you prefer.

How well does Basal-IQ reduce low blood sugars?

Clinical studies show meaningful benefits with Basal-IQ:

• 31% reduction in time spent below 70 mg/dL
• 91% of users said Basal-IQ was easy to use

Fewer and shorter lows can mean steadier days, better sleep, and more confidence.

How does Dexcom G6 integration help day-to-day?

Dexcom G6 integration lets the pump use your real-time CGM data. Helpful features include:

• 10-day sensor wear and a simple auto-inserter
• Water-resistant, discreet sensor design
• Acetaminophen-blocking to reduce false highs
• Data sharing with family, friends, or your care team via the app

What are the main benefits of the t:slim X2 pump?

• Upgradeable software to access new features over time
• Large color touchscreen that’s easy to see and use
• Slim, durable aluminum build—compact yet sturdy
• Rechargeable battery (no disposable batteries)
• Water-resistant housing for everyday life
• 300-unit reservoir for fewer refills
• Micro-Delivery® technology for precise insulin dosing
• Bluetooth® connectivity for app and device syncing

How can the t:connect app make management easier?

The t:connect Diabetes Management App pulls together data from your pump, Dexcom CGM, and select glucose meters. You can view trends, create simple reports for clinic visits, and allow trusted contacts to follow your data. It’s available for Mac and PC, and supports popular meters such as OneTouch®, FreeStyle®, and Accu-Chek® models.

How do Tandem’s remote software updates work?

With the Tandem Device Updater, you can add features without replacing your pump. This helps your device stay current longer and reduces the need to wait for insurance coverage to upgrade hardware.

Which infusion sets work with t:slim X2?

Tandem uses the t:lock™ connector, designed to reduce fill time by ~30 seconds and save ~4.4 units of insulin during setup. Options include:

• AutoSoft™ 90: 90° soft cannula, automatic insertion, reversible connector, 6–9 mm
• AutoSoft™ XC: 90° soft cannula, one-handed automatic insertion for more site options
• AutoSoft™ 30: 30° soft cannula, automatic insertion, 13 mm
• VariSoft™: 30° soft cannula, manual insertion with a window to see placement
• TruSteel™: 90° stainless steel needle, manual insertion, no kinking risk

⚠ What should I know about the recent medical device correction?

Important: Tandem issued a medical device correction for specific t:slim X2 pumps due to a speaker-related malfunction. A failed speaker can cause errors that stop insulin delivery and terminate pump–CGM communication, which may lead to high blood sugar (hyperglycemia).

• Watch for “Malfunction 16.” If you see this alert, the pump is no longer operational. Switch to your backup insulin method (injections or backup pump) immediately.
• Check your serial number. Use Tandem’s official tool to see if your device is affected: serial number check.
• Contact Tandem for replacement. Call 1-877-801-6901 or email techsupport@tandemdiabetes.com.
• Turn on phone alerts. Use the t:slim mobile app with push notifications enabled so you’ll be alerted if this malfunction occurs.
• Upcoming update. Tandem has announced a software update to improve early detection of speaker failure and add persistent vibration alerts to reduce risk.

How does t:slim X2 compare to other pumps?

Tip: Choose based on your priorities—CGM preference, tubed vs. tubeless, update path, and reservoir size.

Is the t:slim X2 right for me?

Consider the t:slim X2 if you want a compact pump with a touchscreen, strong Dexcom G6 integration, and Basal-IQ technology to help prevent lows. The ability to receive remote software updates can extend the life of your device. If you have an affected serial number or see a Malfunction 16 alert, follow the safety steps above and contact Tandem for support.

Practical tips to get started

• Work with your care team to set safe starting basal rates and correction factors.
• Enable CGM alerts that match your lifestyle (e.g., night vs. day thresholds).
• Rotate infusion sites every 2–3 days (or per your set’s instructions) to protect skin and absorption.
• Keep a backup plan: rapid-acting insulin pens/syringes and long-acting insulin if recommended.
• Turn on t:slim mobile app push notifications and keep your phone charged.

What’s the bottom line?

The Tandem t:slim X2 insulin pump combines a friendly design with smart features that help prevent lows and streamline daily care. With Dexcom G6 integration, Basal-IQ technology, and software updates you can install yourself, it’s a strong option for many people. Stay informed about the recent medical device correction and use the safety steps above if your pump is affected—you’ve got this.

Trusted external resources

• Tandem Diabetes Care – t:slim X2 Insulin Pump
• Tandem – t:slim X2 Serial Number Check (Device Correction)
• Dexcom – G6 CGM System
• American Diabetes Association – Insulin Pump Therapy