Syringe Analyzer is one of many tools in Quarantine Zone: The Last Check used to inspect survivors for signs of infection. It's unlocked after completing the second evacuation on the 11th day of the campaign, but players will want to save their spray analyzers for the right moments, as they have a limited supply.
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How the syringe analyzer works in the quarantine zone: The final check
The syringe analyzer is simple. You keep it down on a survivor with (LMB/RT/R2), and within a second the mini screen will appear as green or red.
If it comes up as green, the survivor is not infected and can be sent to the Survivor's Block. This is the case even if they have some orange symptoms, as you now know they are just sick. They will recover from whatever symptoms they have.
If it is orange/red, they are infected and must be sent to Liquidation or shot on site. The Syringe Analyzer has 100% accuracy.
The downside is that Syringes can only be used onceto prevent cross-contamination. When holding this tool, players should see a number indicating how many syringes are left.
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When to use the syringe analyzer in the quarantine zone: The final check
Since the supply is severely limited for spray analyzers, players will want to use them sparingly. For example, never use them before testing a survivor for each known symptombecause finding a red symptom for free means you can kill them without wasting a syringe.
If a survivor has no symptoms at all, or just some green symptoms indicates illness, then they are unlikely to be infected, and they are best not to waste a spray analyzer.
Use the syringe analyzer on those with orange symptoms, but no red symptoms
The times to actually use the syringe analyzer are therefore when individuals have lots of orange symptomswhich can be either disease or infection. If it's an overwhelming amount, they're probably infected and should be discarded, but a normal amount is when you should check with the syringe analyzer.
This is especially true if your quarantine is full by mostly healthy people who are less likely to be infected, like you don't want to send in a potential zombie the.
In fact, send people you are unsure of to quarantine firstand then at the end of the day, use the syringe analyzer on those in quarantine like you suspect is most likely to be infected.
How to Get More Syringe Analyzers in the Quarantine Zone: The Final Check
There is just a way to get more spray analyzers in Quarantine Zone: The Last Checkand this is just once every five dayswhen there is one evacuation.
When evacuating, you will want to send more survivors to the science teamrewarding Research Points and Syringe Analyzersrather than the cash rewards for sending survivors to the military.
A simple syringe analyzer awarded for the following number of survivors sent to the Science Truck:
These will be delivered the following day and should automatically be in your inventory when you wake up.
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Of course, having more survivors to evacuate means more syringe analyzers, RP, and cash, which in turn will help fund more successful diagnoses. Getting good at detecting symptoms Quarantine zone is therefore imperative, as it is the main game loop.
- Released
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January 12, 2026
- Developer
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Brigade game
- Number of players
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Single player
- Compatibility with Steam Deck
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Unknown
