The Stethoscope is an essential diagnostic tool in Quarantine Zone: The Last Check, utilized by players to identify respiratory symptoms in survivors. By detecting black spots and assessing lung sounds, it serves a crucial role in managing survivor health. While it offers more complexity than standard tools, understanding its functionality is key, especially since only one initial breathing symptom is recognized. Additional symptoms can be discovered via the Laboratory.
Players should pay close attention to survivors who exhibit coughing, as they may indicate underlying lung issues. Therefore, a thorough examination using the Stethoscope is highly recommended.
Utilizing the Stethoscope in Quarantine Zone: The Last Check

To operate the Stethoscope effectively, players need only to hold it down to activate its features.
- PC: LMB
- Xbox: RT
- PlayStation: R2
Identifying Black Zones

The initial task when using the Stethoscope is to search for black zones on the lungs. These spots may temporarily fade when hovered over, indicating that the area is clear. Black zones will be the primary indicators to monitor.
It’s important to note that these black zones can also appeared on the survivor’s back. Hence, consistently moving around the individual during the examination is vital to ensure a comprehensive assessment.
Persistence is key—if any black zones remain after inspection, they signal a symptom. Conversely, if all black zones disappear, it suggests the survivor’s lungs are unharmed.
Analyzing Black Zones and Listening for High Frequencies

Upon discovering a persistent black zone, players should now focus on examination. This involves detecting high amplitude waves on the Stethoscope and actively listening to the survivor’s breathing within these areas.
After taking note of the sounds, compare them to the examples provided in the symptoms chart. Initially, only the Sickly Breath symptom is known. If the sound matches, select it; otherwise, consider sending the survivor to the lab for further testing to uncover new symptoms.
Upgrading the Stethoscope in Quarantine Zone: The Last Check


In Quarantine Zone, players can enhance their tools using Research Points. The Stethoscope has three major upgrades, each designed to improve its efficiency during use.
|
Zone Level |
Upgrade |
Description |
Research Points |
|---|---|---|---|
|
III |
Stethoscope: Color Indicator |
Incorporates a color filter for identifying normal, nonspecific, and infected sounds. |
100 RP |
|
III |
Stethoscope: Amplified Sensors |
Features tuned sensors for improved audio clarity and larger black zone detection. |
100 RP |
|
V |
Stethoscope: Smart Filter |
Eliminates irrelevant black zones from the display. |
150 RP |
The most crucial upgrade is undoubtedly the Color Indicator. Once obtained, players can simply assess the color over black spots, minimizing the dependency on sound.
- Green (Low Frequency): Indicates a healthy condition
- Green (High Frequency): Suggests sickness
- Yellowish Green: Indicates potential sickness or infection
- Red: Confirms infection
The Smart Filter upgrade also proves beneficial, as it ensures that only pertinent black zones are displayed, thus optimizing examination time. However, players must progress in the game to unlock this feature.
Comprehensive Stethoscope Symptoms in Quarantine Zone: The Last Check

|
Sickness |
Undetermined |
Infected |
|---|---|---|
|
Sickly Breath |
Nonspecific Respiration |
Infected Breath |
Initially, players will only recognize the Sickly Breath symptom, but a total of three symptoms can eventually be identified. Notably, the visual cues of black zones remain unchanged across these symptoms, emphasizing the importance of auditory assessment and the use of the Color Indicator upgrade.
Sickly Breath – Sickness

A Sickly Breath produces a low wheezing sound and will show bright green with the color upgrade enabled.
Nonspecific Respiration – Sickness or Infection

This symptom causes the survivor to wheeze upon inhaling while exhaling silently—making it challenging to differentiate from Sickly Breath. To accurately distinguish between them, utilize the Color Indicator upgrade to observe for changes to a more yellowish-green hue.
Infected Breath – Infected

A survivor exhibiting Infected Breath will produce a low growling noise, reminiscent of a lion’s roar. When utilizing the upgraded Stethoscope, this will register as red, indicating an infection.
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